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

### Instruction:
Hawkeye is driving to his aunt. He has to charge his battery for $3.5 per charge. If he charged his battery four times, and his battery charging budget was $20, how much money was he left with when he reached his aunt's place?

### Response:
 Ikiwa kila malipo ya betri yanagharimu $3.5, gharama jumla ya malipo ya betri mara nne ni 4*3.5 = $<<4*3.5=14>>14.
Baada ya gharama yake ya kuchaji betri, alikuwa na kiasi cha 20-14 = $<<20-14=6>>6.