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

### Instruction:
Mell went to a cafeteria to spend some time with her friends. She ordered two cups of coffee and one piece of cake. Two of her friends ordered the same, but each of them also bought a bowl of ice cream. One cup of coffee is $4, one piece of cake is $7, and a bowl of ice cream is $3. How much money did Mell and her friends need to pay at the cafeteria?

### Response:
 Marafiki wa Mell walikununua vikombe viwili vya barafu, hivyo walilipa 2 * 3 = $<<2*3=6>>6 kwa ajili yao.
Wote watatu walikununua vikombe viwili vya kahawa kila mmoja, hivyo walikununua vikombe 2 * 3 = <<2*3=6>>6 vya kahawa jumla.
Hivyo, walilipa 6 * 4 = $<<6*4=24>>24 kwa ajili ya kahawa.
Kila mmoja wao alinunua kipande kimoja cha keki, hivyo walikununua vipande 1 * 3 = <<1*3=3>>3 vya keki jumla.
Hivyo, jumla Mell na marafiki zake walilipa 24 + 6 + 21 = $<<24+6+21=51>>51 kwenye kafeteria.