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

### Instruction:
Roxanne bought 2 cups of lemonade for $2 each and 2 sandwiches for $2.50 each. How much change must she get from a $20 bill?

### 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.