Ian spent half the money he made on doing online surveys. If he worked 8 hours doing surveys and on average he's able to earn $18 per hour doing surveys, how much money does he have left?
Ian is able to earn $18 per hour doing surveys. If he worked 8 hours doing surveys, then he earned $18*8 = $
<gadget id="calculator">18*8</gadget>
<output>144</output>
144.
If he spent half of what he earned, then he spent $144 * 50% = $
<gadget id="calculator">144*50*.01</gadget>
<output>72</output>
72.
If Ian spent $72 of his earnings, then he has $144 - $72 = $
<gadget id="calculator">72</gadget>
<output>72</output>
72 left.

<result>72</result>