Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
 Derek ana $960 kununua vitabu vyake kwa semester. Anatumia nusu ya hiyo kwa vitabu vyake, na anatumia robo ya kilichobaki kwa vifaa vya shule. Ni kiasi gani cha pesa Derek anabakiwa nacho?


### Response:
 Derek anatumia 960/2 = <<960/2=480>>480 dola kwa vitabu.
Anabakiwa na 960-480 = <<960-480=480>>480 dola.
Anatumia 480/4 = <<480/4=120>>120 dola kwa vifaa vya shule.
Derek anabakiwa na 480-120 = <<480-120=360>>360 dola.