Change text numbers based on user input
<p>I want to be able to change some text numbers based on what the user inputs into a text input.</p>

<p>See mock up below:</p>

<p><img src="http://i.stack.imgur.com/t7kxv.png" alt="enter image description here"></p>

<p>So when the user types in the per hour box I want the per annum figure to change.</p>

<p>Is this possible? If so how?</p>
