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

### Instruction:
John buys dinner plates and silverware.  The silverware cost $20.  The dinner plates cost 50% as much as the silverware.  How much did he pay for everything?

### Response:
 Sahani za chakula zina gharama ya $20 * 0.5 = $<<20*0.5=10>>10
Hivyo alilipa $10 + $20 = $<<10+20=30>>30 kwa kila kitu.