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

### Instruction:
Marcus is having a water balloon party. He has 100 balloons. Each balloon holds 3 ounces of water. He can buy 50 ounces of water for $2.5 a bottle. If he walks into the store with 2 $10 bills, how much change will he have after he buys all the water he needs?

### Response:
 Anahitaji maji ya unga wa 300 kwa sababu 100 x 3 = <<300=300>>300
Anahitaji chupa 6 kwa sababu 300 / 50 = <<300/50=6>>6
Atalipa $15 kwa sababu 6 x 2.5 = <<6*2.5=15>>15
Ana $20 kwa sababu 2 x 10 = <<2*10=20>>20
Atapata $5 kama mabadiliko kwa sababu 20 - 15 = <<20-15=5>>5