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

### Instruction:
Don buys recyclable bottles in a small town. Shop A normally sells him 150 bottles, shop B sells him 180 bottles and Shop C sells him the rest. How many bottles does Don buy from Shop C if he is capable of buying only 550 bottles?

### Response:
 Jumla ya chupa ambazo Don hununua kutoka maduka A, B, na C ni 150 + 180 + C = <<150+180+C=550>>550
Kwa kuwa C ni idadi ya chupa anazonunua kutoka Duka C, C = 550 - 150 - 180 = <<550-150-180=220>>220