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

### Instruction:
 Sean ananunua makopo 3 ya soda, supu 2, na sandwich 1. Kila supu inagharimu kama soda 3 zilizounganishwa. Sandwich inagharimu mara 3 ya supu. Ikiwa soda inagharimu $1, gharama ya kila kitu ilikuwa kiasi gani pamoja?


### Response:
 Soda inagharimu 3*1=$<<3*1=3>>3
Hivyo supu inagharimu 2*3=$<<2*3=6>>6
Sandwich inagharimu 3*3=$<<3*3=9>>9
Hivyo jumla ya gharama ni 3+6+9=$<<3+6+9=18>>18