JSFiddle - React, Tailwind, and code Playground
HTML
<form oninput="amount.value = parsInt(a.value)*parsInt(b.value)"> <br />
<b>Sales Summary:</b><br>
Price = $<input type="number" id="a" ><br />
Quantity = <input type="number" id="b" >units<br />
Discount = <input type="number" id="c" min=”0” max=”100”> %<br />
Net Total Amount = $<output id="amount"for="a b c"></output>
</form>