JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.15/angular.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<div class="container" style="margin-top:50px;">
    <p class="text-center"><b>Considering These Amounts:</b>
        <br/> <b>Cost:</b> $50.00
        <br/> <b>Markup:</b> 30% or .30
        <br/>The <b>final sale</b> price should be: $65.00
        <br/>
        <hr/>
        <p class="text-center">Item Cost + (Item Cost x Markup Percentage) = Price
            <br/>50 + (50 x .30 = $15) = $65</p>
    </p>
    <hr/>
    <div class="row" ng-app>
        <div class="col-sm-4">
            <div class="form-group">
                <input type="text" ng-model="pr.cost" class="form-control" placeholder="Cost" />
            </div>
        </div>
        <div class="col-sm-4">
            <div class="form-group">
                <input type="text" ng-model="pr.markup" class="form-control" placeholder="Markup %" />
            </div>
        </div>
        <div class="col-sm-4">
            <div class="form-group">
                <input type="text" class="form-control" placeholder="{{pr.type}} Sale" value="{{pr.cost+(pr.cost*pr.markup)|currency}}" readonly/>
            </div>
        </div>
    </div>
</div>