<human>:  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?
<bot>: How much did Derek spend on textbooks? ** Amount spent on textbooks is 960/2 = <<960/2=480>>480 dollars.
How much did Derek spend on school supplies? ** Amount spent on school supplies is 480/4 = <<480/4=120>>120 dollars.
What is the amount of money Derek has left? ** Amount Derek has left 960-480-120 = <<960-480-120=360>>360 dollars.
#### 360