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

### Instruction:
Mark hires a singer for 3 hours at $15 an hour.  He then tips the singer 20%.  How much did he pay?

### Response:
The cost was 15*3=$<<15*3=45>>45.
So the tip was 45*.2=$9.
So in total he paid 45+9=$<<45+9=54>>54.
#### 54