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

### Instruction:
At the patisserie, a single layer cake slice is $4 and a double layer cake slice is $7.  Dusty buys 7 single layer cake slices and 5 double layer cake slices.  If he pays with a $100 bill, how much change does he receive?

### Response:
 Vipande vya keki ya safu moja vina gharama ya $4 x 7 = $<<4*7=28>>28.
Vipande vya keki ya safu mbili vina gharama ya $7 x 5 = $35.
Jumla ya vipande vyote vya keki inagharimu $28 + $35 = $<<28+35=63>>63.
Atapokea mabadiliko ya $100 - $63 = $37.