Given the following data, calculate the average cost of a meal.
Cost of meals: $15, $20, $12, $18
The average cost of a meal is $16.50.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Given the following data, calculate the average cost of a meal.

### Response:
The average cost of a meal is $16.50.