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

### Instruction:
Mary wants to bake 10 apple pies for a charity event. Each pie needs 8 apples and she already harvested 50 apples from the trees in her garden. How many more apples does she need to buy to make all 10 pies?

### Response:
 Ili apike mikate 10, Mary anahitaji tufaha 8 * 10 = <<8*10=80>>80.
Kwa kuwa ana tufaha 50, anahitaji kununua 80 - 50 = <<80-50=30>>30 zaidi.