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

### 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:
The two $20 bills amount to $20 x 2 = $<<20*2=40>>40.
The three $5 bills amount to $5 x 3 = $<<5*3=15>>15.
So, Marj has $40 + $15 + $4.50 = $<<40+15+4.5=59.50>>59.50 in her wallet.
Since Marj spent $17.50 for the cake, she will be left with $59.50 - $17.50 = $<<59.50-17.5=42>>42.
#### 42