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

### Instruction:
 Roberta anaenda dukani na $158 kwa ajili ya kununua vitu. Anatumia $45 kwa viatu vipya, $17 chini kwa begi jipya, na robo ya bei ya begi kwa ajili ya chakula cha mchana. Anabakiwa na pesa ngapi baada ya manunuzi haya?


### Response:
 Begi la Roberta linagharimu $45 - $17 = $<<45-17=28>>28.
Roberta anatumia $28 / 4 = $<<28/4=7>>7 kwa chakula cha mchana.
Roberta anatumia jumla ya $45 + $28 + $7 = $<<45+28+7=80>>80.
Roberta anabakiwa na $158 - 80 = $<<158-80=78>>78.