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

### Instruction:
One set of barrettes costs $3 each, and one comb costs $1 each. Kristine buys one set of barrettes and one comb. Crystal buys three sets of barrettes and one comb. How much do the two girls spend altogether?

### Response:
 Kristine anatumia 3 + 1 = <<3+1=4>>4 dola.
Crystal anatumia 3 x 3 + 1 = <<3*3+1=10>>10 dola.
Kristine na Crystal wanatumia 4 + 10 = <<4+10=14>>14 dola pamoja.