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

### Instruction:
Tom went to the store to buy fruit. Lemons cost $2, papayas cost $1, and mangos cost $4. For every 4 fruits that customers buy, the store offers a $1 discount. Tom buys 6 lemons, 4 papayas, and 2 mangos. How much will he pay?

### Response:
 Tom amenunua matunda 6+4+2=<<6+4+2=12>>12
Kwa matunda 12, Tom anapata punguzo la 12/4 = <<12/4=3>>3 dola
Tom amenunua limau 6 ambayo inagharimu 6*2= <<6*2=12>>12 dola
Tom amenunua papaya 4 ambayo inagharimu 4*1= <<4*1=4>>4 dola
Tom amenunua embe 2 ambayo inagharimu 2*4=<<2*4=8>>8 dola
Jumla ya gharama ya matunda kabla ya punguzo ni 12+4+8= <<12+4+8=24>>24 dola
Kwa kutoa punguzo linalotolewa na duka, Tom atalipa 24-3= <<24-3=21>>21 dola