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

### Instruction:
 Penny ana $20. Penny ananunua jozi 4 za soksi kwa $2 kwa jozi na kofia kwa $7. Penny anabakiwa na pesa kiasi gani?


### Response:
 Penny ananunua jozi 4 za soksi kwa $2 x 4 = $<<4*2=8>>8.
Jumla yote, Penny anatumia $8 + $7 = $<<8+7=15>>15 kwa jozi 4 za soksi na kofia.
Penny anabakiwa na $20 - $15 = $<<20-15=5>>5 baada ya kununua jozi 4 za soksi na kofia.