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

### Instruction:
Samuel has $5, $10, and $20 bills which amount to $150 in his wallet. His $10-bills amount to $50, and he has 4 $20-bills. How many bills does Samuel have in his wallet?

### Response:
 Samuel ana noti 4 za $20, hivyo $100 iliyobaki inajumuisha noti za $10 na $5.
Kwa kuwa noti za $10 zina jumla ya $50, $50 iliyobaki inajumuisha noti za $5.
Hivyo, Samuel ana noti 4 za $20, 5 za $10, na 10 za $5, jumla ya noti 19.