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HTML 

              
                  <div class="wrapper">
    <div class="content">
      <form action="">
        <div class="price-info">
          <div class="total" id="total">合計<span>1商品</span>選択中</div>
          <div class="price-txt">合計金額<span class="red"><span class="price-chg" id="price-chg">6,000</span>円</span>(税込)</div>
        </div>
        <p>カートに入れる商品を選択してください</p>
        <div class="select-item">
          <ul class="item-list item-calc">
            <li>
              <input type="checkbox" class="select-checkdox" id="select-checkdox-01" name="select-checkdox">
              <label for="select-checkdox-01" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金アイテムA</div>
                <div class="price">150円</div>
              </label>
            </li>
            <li>
              <input type="checkbox" class="select-checkdox" id="select-checkdox-02" name="select-checkdox" >
              <label for="select-checkdox-02" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金アイテムB</div>
                <div class="price">500円</div>
              </label>
            </li>
            <li>
              <input type="checkbox" class="select-checkdox" id="select-checkdox-03" name="select-checkdox" checked>
              <label for="select-checkdox-03" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金アイテムC</div>
                <div class="price">500円</div>
              </label>
            </li>
            <li>
              <input type="checkbox" class="select-checkdox" id="select-checkdox-04" name="select-checkdox" >
              <label for="select-checkdox-04" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金アイテムD</div>
                <div class="price">1,000円</div>
              </label>
            </li>
          </ul>
          <h3 class="subttl">今だけ！！お得な課金パック！</h3>
          <ul class="item-list item-calc">
            <li>
              <input type="checkbox" class="select-checkdox" id="select-pack-checkdox-01" name="select-checkdox" >
              <label for="select-pack-checkdox-01" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金パックA</div>
                <div class="price">3,000円</div>
              </label>
            </li>
            <li>
              <input type="checkbox" class="select-checkdox" id="select-pack-checkdox-02" name="select-checkdox">
              <label for="select-pack-checkdox-02" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金パックB</div>
                <div class="price">5,000円</div>
              </label>
            </li>
            <li>
              <input type="checkbox" class="select-checkdox" id="select-pack-checkdox-03" name="select-checkdox">
              <label for="select-pack-checkdox-03" class="item-info">
                <div class="check-img"></div>
                <div class="ttl">課金パックC</div>
                <div class="price">10,000円</div>
              </label>
            </li>
          </ul>
        </div>
        <div class="btn-area"><a class="form-submit btn-submit" href="#">カートに入れる</a></div>
      </form>
    </div>
  </div>
!

CSS 

              
                 input[type="checkbox"]{
   display: none;
}
html{
  font-size:62.5%;
}
body{
  font-size:1.4rem;
  line-height:1.3;
  letter-spacing:0.05em;
}
a{
  text-decoration:none;
}
ul,li{
  margin:0;
  padding:0;
  list-style-type:none;
}
div,p{
  margin:0;
  padding:0;
}
.wrapper{
  margin:0 auto;
  width:100%;
  max-width:1080px;
}
.content{
  padding:40px 0;
}
//color
.red{
  color:#f00;
}
//price-info
.price-info{
  background:#efefef;
  padding:20px;
  margin-bottom:40px;
  box-sizing:border-box;
}
.total{
  font-size:1.8rem;
  margin-bottom:10px;
  span{
    font-weight:bold;
  }
}
.price-txt{
  font-size:1.6rem;
  span{
    display:inline-block;
    margin:0 3px;
  }
}
.select-item{
  padding-top:40px;
}
//item-list
.item-list{
  display:flex;
  flex-wrap:wrap;
  >li{
    margin-left:10px;
    &:first-child{
      margin-left:0;
    }
  }
}
label{
  display:block;
  position:relative;
  padding:10px 10px 10px 40px;
  width:100%;
  height:100%;
  border:2px solid #ddd;
  border-radius:5px;
  box-sizing:border-box;
  transition: border-color .3s,color .3s
}
.check-img{
  position:absolute;
  width:12px;
  height:12px;
  border-radius:5px;
  border:2px solid #ddd;
  left:10px;
  top:0;
  bottom:0;
  margin:auto;
  &:before{
    content:"";
    position:absolute;
    width:4px;
    height:2px;
    background:#fff;
    left:2px;
    top:5px;
    transform:rotate(45deg);
    border-radius:5px 0 0 5px;
    transition:.3s;
  }
  &:after{
    content:"";
    position:absolute;
    width:6px;
    height:2px;
    background:#fff;
    left:4px;
    top:5px;
    transform:rotate(-45deg);
    border-radius:0 5px 5px 0;
    transition:.3s;
  }
}
input[type="checkbox"]:checked{
  +label{
    border-color:#33cccc;
    color:#33cccc;
    .check-img{
      &:before{
        background:#33cccc; 
      }
      &:after{
        background:#33cccc;    
      }
    }
  }
}
//subttl
.subttl{
  margin:40px 0 10px;
}
//btn
.btn-submit{
  display:block;
  width:100%;
  max-width:300px;
  padding:10px 0;
  margin:0 auto;
  border:2px solid #33cccc;
  text-align:center;
  border-radius:5px;
  color:#33cccc;
  transition:.3s;
  &:hover{
    background:#33cccc;
    color:#fff;
  }
}
.btn-area{
  margin-top:40px;
}
!

JS 

              
                   (function () {
     let $total = $('#total>span');
      let $priceChg = $('#price-chg');
      let $itemCalcLi = $('.item-calc > li');
      let selectItemArray = []; //金額とcheckの有無を格納する　


      //金額と個数を計算、出力
      function priceTxtChange() {
        let price = 0; //金額
        let priceNum = 0; //個数

        for (let b = 0; b < selectItemArray.length; b++) {
          if (selectItemArray[b][1] === true) {//selectItemArray[b][1]の値がtrueのものだけを計算する
            price = price + selectItemArray[b][0];
            priceNum++;
          }
        }
        price = String(price).replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1,'); //カンマ区切りにする
        $priceChg.text(price);
        $total.text(priceNum + '商品');
      }

      //最初にに金額とcheckの有無を格納する
      function createItemCheckArray() {
        for (let a = 0; a < $itemCalcLi.length; a++) {
          let itemCalcLiPrice = $itemCalcLi.eq(a).find('.price').text();
          itemCalcLiPrice = itemCalcLiPrice.replace(/[^0-9]/g, ''); //数字だけ抜き出す
          itemCalcLiPrice = Number(itemCalcLiPrice); //数値に変換

          //選ばれているかどうか 選ばれているならtrue
          let itemRSelected;
          let watchCheckbox = $itemCalcLi.eq(a).find('input[type="checkbox"]');
          if (watchCheckbox.prop('checked')) {
            itemRSelected = true;
          } else {
            itemRSelected = false;
          }
          selectItemArray.push([itemCalcLiPrice, itemRSelected]);//金額とcheckの有無を格納
        };
      };
     
     //load時に読ませる
     createItemCheckArray();
     priceTxtChange();
     
     
      //クリックされた時に値を変える
      function changeItemCheckArray(index, thisCheckToggle) {
        if (thisCheckToggle) {
          // チェックボックスがチェックされているならselectItemArray[index][1]をtrueに、違うならfalseに書き換える
          selectItemArray[index][1] = true;
        } else {
          selectItemArray[index][1] = false;
        }
        return priceTxtChange();//priceTxtChangeを呼びだし計算
      };
     
     //$itemCalcLiクリックした時
      $itemCalcLi.on('click', function () {
        var index = $('.item-calc >li').index(this);
        let thisCheckToggle;
        let thisCheckbox = $(this).find('input[type="checkbox"]');

        if (thisCheckbox.prop('checked')) {//チェックボックスがチェックされているならtrue、違うならfalse
          thisCheckToggle = true;
        } else {
          thisCheckToggle = false;
        }
        return changeItemCheckArray(index, thisCheckToggle);
      });

      //ボタンを押されたらsubmit
      // let $formSubmit = $('.form-submit');
      // $formSubmit.on('click', function () {
      //   $('form').submit();
      //   return false;
      // });


    })();
!
999px

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