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

### Instruction:
Gemma ordered four pizzas at $10 each, and she gave a $5 tip to the delivery person. How much change did she get back if she gives one fifty-dollar bill?

### Response:
 Gharama ya pizza nne ni 4 x $10 = $<<4*10=40>>40.
Gemma alitoa tipu ya $5 kwa dereva, hivyo jumla ya gharama ilikuwa $40 + $5 = $<<40+5=45>>45.
Hivyo, Gemma anatoa $50 aliponunua pizza nne.
Hivyo, pesa yake ya kubadilisha ni $50 - $45 = $<<50-45=5>>5.