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

### Instruction:
Four tires and one battery together cost $224. Each tire costs $42. Calculate the price of the battery.

### Response:
The cost of the four tires is 4 * $42 = $<<4*42=168>>168.
So, the price of the battery is $224 - $168 = $<<224-168=56>>56.
#### 56