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

### Instruction:
Calvin buys a pack of chips, for $0.50, from the vending machine at lunch, 5 days a week. After 4 weeks, how much money has Calvin spent on chips?

### Response:
If Calvin buys a bag of chips for $0.50, 5 days a week, then in one week he spends $0.50 * 5 = $<<0.50*5=2.50>>2.50 on chips
After 4 weeks, Calvin spends $2.50 * 4 = $<<4*2.5=10.00>>10.00 on chips
#### 10