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

### Instruction:
Luca went to a sandwich shop for lunch. The sandwich he bought was normally $8, but he had a coupon for a quarter of the price off. He then upgraded it with sliced avocado for an extra dollar. After adding a drink and a $3 salad, his total lunch bill was $12. How many dollars did Luca pay for his drink?

### Response:
 Kupon ya Luca ilimwokoa $8 / 4 = $<<8/4=2>>2 kwenye sandwich yake.
Sandwich iligharimu $8 - $2 = $<<8-2=6>>6.
Alilipa $6 + $1 = $<<6+1=7>>7 kwa sandwich na nyanya.
Alilipa $7 + $3 = $<<7+3=10>>10 kwa chakula bila kinywaji.
Alilipa $12 - $10 = $<<12-10=2>>2 kwa kinywaji chake.