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

### Instruction:
Reginald is selling apples. He sells each apple for $1.25. He plans to use his profits to help repair his bike. His bike cost $80 and the repairs cost 25% of what his bike cost. After the repairs are paid for, 1/5 of the money he'd earned remains. How many apples did he sell?

### Response:
 Gharama za ukarabati wa baiskeli ni $20 kwa sababu 80 x .25 = <<80*.25=20>>20
Wito kiasi anachopata kuwa e. Tunajua kuwa e - 20 = 1/5e
Hivyo 5e - 100 = e
Hivyo, 4e = 100
Hivyo, e = <<25=25>>25
Hivyo, ameuza tufaha 20 kwa sababu 25 / 1.25 = <<25/1.25=20>>20