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

### Instruction:
Marj has two $20 bills, three $5 bills, and $4.50 in loose coins in her wallet. If she buys a cake that costs $17.50, how much money will be left in her wallet?

### Response:
 Noti mbili za $20 zina thamani ya $20 x 2 = $<<20*2=40>>40.
Noti tatu za $5 zina thamani ya $5 x 3 = $<<5*3=15>>15.
Hivyo, Marj ana $40 + $15 + $4.50 = $<<40+15+4.5=59.50>>59.50 katika mkoba wake.
Marj ametumia $17.50 kwa keki, hivyo atabakiwa na $59.50 - $17.50 = $<<59.50-17.5=42>>42.