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HTML 

              
                <div class="row">
	<div class="col-md-12">
		<div class="jumbotron w-75 mx-auto my-3">
			<h3>Grading Style Outcome Tool</h3>
			<form id="grade-checker">
				<div class="form-group row">
					<label class="col-sm-9 col-form-label" for="points">How many points is the question worth?</label>
					<div class="col-sm-3">
						<input type="number" class="form-control" id="points" value="10" required/>
					</div>
				</div>
				<fieldset class="form-group">
					<div class="row">
						<legend class="col-form-label col-sm-4 pt-0">Question Type</legend>
						<div class="col-sm-8">
							<div class="form-check">
								<input class="form-check-input" type="radio" id="MC-type" value="0" name="item-type" checked>
								<label class="form-check-label" for="MC-type">Multiple Choice</label>
							</div>
							<div class="form-check">
								<input class="form-check-input" type="radio" id="num-type" value="1" name="item-type">
								<label class="form-check-label" for="num-type">Numeric/Algebraic/Short Answer</label>
							</div>
						</div>
					</div>
				</fieldset>
				<div class="form-group row" id="choices-div">
					<label class="col-sm-9 col-form-label" for="choices">How many choices does the question have?</label>
					<div class="col-sm-3">
						<input type="number" class="form-control" id="choices" value="5" min="2" max="10" required/>
					</div>
				</div>
				<input type="button" class="btn btn-primary" onclick="pointsCalculator();" value="Submit" />
			</form>
		</div>
		<div class="w-75 mx-auto mb-3 card" id="results-div">
			<table class="table table-hover w-100 text-center">
				<thead class="thead-light">
					<tr>
						<th scope="col" class="w-25">Try</th>
						<th scope="col" class="w-25">Negative Points</th>
						<th scope="col" class="w-25">No Negative Points</th>
						<th scope="col" class="w-25">One Free Try</th>
					</tr>
				</thead>
				<tbody id="results">
				</tbody>
			</table>
		</div>
	</div>
</div>
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CSS
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JS 

              
                document.getElementById('MC-type').addEventListener('change', choicesController);
document.getElementById('num-type').addEventListener('change', choicesController);

function choicesController() {
	let itemType = (document.getElementById('MC-type').checked) ? 0 : 1;
	
	if (itemType == 0) {
		document.getElementById('choices-div').innerHTML = '<label class="col-sm-9 col-form-label" for="choices">How many choices does the question have?</label><div class="col-sm-3"><input type="number" class="form-control" id="choices" value="5" min="2" max="10" required/></div>';
	} else {
		document.getElementById('choices-div').innerHTML = "";
	}
}

function pointsCalculator() {
	let points = Number(document.getElementById('points').value);
	let itemType = (document.getElementById('MC-type').checked) ? 0 : 1;
	let choices = (document.getElementById('MC-type').checked) ? Number(document.getElementById('choices').value) : 7;
	let output = "";
	let scoresNeg = [];
	let scoresPos = [];
	let scoresFree = [];

	if (itemType == 0) { // MC items
		for(let i = 0; i < choices; i++) {
			scoresNeg[i] = (points * (1 - 2 * (i/(choices - 1)))).toFixed(2); // negative points allowed
			scoresPos[i] = ((-points/(choices - 1) * i) + points).toFixed(2); // no negative points
		}
		for(let i = 0; i < choices; i++) { // one free try
			(i == 0) ? scoresFree[i] = (points).toFixed(2) : scoresFree[i] = ((-points/(choices - 2) * (i-1)) + points).toFixed(2);
		}

		for (let j = 0; j < choices-1; j++) {
			output += '<tr><th scope="row">'+(j+1)+'</th><td>'+scoresNeg[j]+'</td><td>'+scoresPos[j]+'</td><td>'+scoresFree[j]+'</td></tr>';
		}

		output += '<tr><th scope="row">Never Correct</th><td>'+scoresNeg[scoresNeg.length-1]+'</td><td>'+scoresPos[scoresPos.length-1]+'</td><td>'+scoresFree[scoresFree.length-1]+'</td></tr>';

	} else { // nfr, afr, short answer
		for (let i = 0; i < 7; i++) { // one free try
			if (i == 0) {
				scoresFree[i] = (points * Math.pow(0.93,i)).toFixed(2);
			} else {
				scoresFree[i] = (points * Math.pow(0.93,(i-1))).toFixed(2);
			}
		}
		for (let i = 0; i < 7; i++) { // not one free try
			scoresNeg[i] = (points * Math.pow(0.93,i)).toFixed(2);
			scoresPos[i] = (points * Math.pow(0.93,i)).toFixed(2);
		}

		for (let j = 0; j < 7; j++) {
			output += '<tr><th scope="row">'+(j+1)+'</th><td>'+scoresNeg[j]+'</td><td>'+scoresPos[j]+'</td><td>'+scoresFree[j]+'</td></tr>';
		}

		output += '<tr><th scope="row">Never Correct</th><td>0</td><td>0</td><td>0</td></tr>';
	}

	document.getElementById('results').innerHTML = output;
}
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