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

### Instruction:
 Roxanne alinunua vikombe 2 vya limau kwa $2 kila kimoja na sandwichi 2 kwa $2.50 kila moja. Anapaswa kupata kiasi gani cha pesa taslimu kutoka kwenye noti ya $20?


### Response:
 Vikombe viwili vya limau vina thamani ya $2 x 2 = $<<2*2=4>>4.
Sandwichi mbili zina thamani ya $2.50 x 2 = $<<2.5*2=5>>5.
Hivyo, jumla ya pesa ambayo Roxanne alilazimika kulipa ni $4 + $5 = $<<4+5=9>>9.
Hivyo, anapaswa kupata pesa taslimu $20 - $9 = $<<20-9=11>>11.