Derek has $960 to buy his books for the semester. He spends half of that on his textbooks, and he spends a quarter of what is left on his school supplies. What is the amount of money Derek has left?
Amount spent on textbooks is 960/2 = 
<gadget id="calculator">960/2</gadget>
<output>480</output>
480 dollars.
Amount spent on school supplies is 480/4 = 
<gadget id="calculator">480/4</gadget>
<output>120</output>
120 dollars.
Amount Derek has left 960-480-120 = 
<gadget id="calculator">960-480-120</gadget>
<output>360</output>
360 dollars.

<result>360</result>