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

### Instruction:
John puts $25 in his piggy bank every month for 2 years to save up for a vacation. He had to spend $400 from his piggy bank savings last week to repair his car. How many dollars are left in his piggy bank?

### Response:
 Miaka 2 ni sawa na 12 * 2 = <<2*12=24>>24 miezi.
Anaokoa $25 * 24 = <<25*24=600>>600 dola kwa miaka 2.
Alitumia $400, hivyo ana $600 - $400 = <<600-400=200>>200 dola zilizobaki.