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

### Instruction:
Michael has 4 packs of crayons and wants to buy 2 more. One pack of crayons costs $2.5. How much are all the packs of crayons Michael will have after the purchase worth?

### Response:
Michael has 4 packs, so he will have 4 + 2 = <<4+2=6>>6 packs after buying 2 more.
In total all packs are going to be worth 6 packs * $2.5/pack = $<<6*2.5=15>>15.
#### 15