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HTML 

              
                <center>
<div class ="form">
		<h2> Sales Tax Calculator</h5>
		<form name="orderform" id="orderform">
		<table>
</div>
  <tr><th>
   <label>Product: </label>
  </th>
  <th scope="row">
   <div align="left">
    <label><span>$</span></label>
    <input name="price" type="text" id="price" size="10">
   </div>
  </th>

  
  <tr><th>
   <label>Quantity</label>
  </th>
  <th scope="row">
   <div align="left">
    <label><span>#</span></label>
    <input name="quantity" type="text" id="quantity" size="10">
   </div>
  </th>
 
  <tr><th>
   <label>Subtotal:</label>
  </th>
  <th scope="row">   
   <div align="left">
    <label>$</label>
    <input name="subtotal" type="text" id="subtotal" onFocus="this.form.elements[1].focus()" size="10"> &nbsp;&nbsp;
    <input name="subBtn" onClick="subTotal();" type="button" id="subBtn" value="Subtotal">
   </div>
  </th>
 </tr>
  
   <tr><th>
   <label>Tax:</label>
  </th>
   <th scope="row">
   <div align="left">
    <label>$</label>
     <input name="salestax" type="text" id="salestax" onFocus="this.form.elements[1].focus()" size="10"> &nbsp;&nbsp;               
     <input name="taxBtn" onClick="calculateTax();" type="button" id="taxBtn" value="Tax">  
   </div>
  </th>
 </tr>
 
  <tr><th>
   <label>Total:</label>
  </th>
  <th scope="row">
   <div align="left">
    <label>$</label>
    <input name="gtotal" type="text" id="gtotal" onFocus="this.form.elements[2].focus()" size="10"> &nbsp;&nbsp;
    <input name="gtotalBtn" onClick="grandTotal();" type="button" id="gtotalBtn" value="Calculate Order">
   </div>
  </th>
 </tr>
</table>
</form>      
</div>
</center>
!

CSS 

              
                table{
  border-style: solid;
  border-color: black;
  border-width: 5px;
  border-radius: 5px;
  background-color: silver;
}
#subBtn{
  border-style: solid;
  border-color: black;
  border-width: 2px;
  border-radius: 5px;
}
#taxBtn{
  border-style: solid;
  border-color: black;
  border-width: 2px;
  border-radius: 5px;
}
#gtotalBtn{
  border-style: solid;
  border-color: black;
  border-width: 2px;
  border-radius: 5px;
}
!

JS 

              
                function subTotal() {
  var price = document.orderform.price.value;
  var quantity = document.orderform.quantity.value;
  productPrice = price * quantity;
  document.orderform.subtotal.value = productPrice.toFixed(2);
  return productPrice;
}
//calculateTax() takes result of subTotal function but has to refer to the result to move forward as opposed to the previous function
//.toFixed() is the decimal points
function calculateTax() {
  //var subTotal = document.orderform.subtotal.value; OR for dryer code:
  var subtotal = subTotal();
  var stax = 0.03;
    tax = subtotal * stax;
  document.orderform.salestax.value = tax.toFixed(3);
  return tax;
}
//takes the HTML output results from the previous two functions and adds them together. 
function grandTotal() {
  var subtotal = subTotal();
  var tax = calculateTax();
  document.orderform.subtotal.value = subtotal.toFixed(2);
  document.orderform.salestax.value = tax.toFixed(2);
  var gtotal = subtotal + tax;
  document.orderform.gtotal.value = gtotal.toFixed(2);
}
!
999px

Console