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

### Instruction:
 Linda anatengeneza na kuuza mikufu kwenye maonyesho ya ufundi. Kwenye maonyesho yake ya hivi karibuni, aliuza mikufu 4 na pete 8 kwa jumla ya $80. Ikiwa kila mkufu gharama $12, pete kila moja gharama kiasi gani?


### Response:
 Tumia r kwa gharama ya kila mkufu
4*12 + 8*r = 80
48 + 8*r = 80
8*r = 80 - 48 = 32
8r = 32
r = <<4=4>>4 dola kwa kila pete