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

### Instruction:
Tomorrow, Pete must finish paying off the last $90 he owes on a bike. He goes through his wallet and finds two $20 bills. Checking his pockets, he finds four $10 bills. Unhappy that he doesn't have the entire amount, he suddenly remembers that he has plastic bottles that can be returned to his local store for cash. If the store pays 50 cents for each bottle, how many bottles will Pete have to return to the store?

### Response:
 Mkoba wa Pete una dola 40 kwa sababu 2 x 20 = 40
Fedha katika mifuko ya Pete ni dola 40 kwa sababu 4 x 10 = 40
Jumla Pete ana dola 40 + 40 = 80
Anadaiwa dola 90 kwa baiskeli na kwa hivyo anahitaji dola 90 - 80 = 10 zaidi
Kwa kuwa senti 50 ni ½ dola, basi idadi ya chupa inayohitajika kupata 10 dola ni 10 / (1/2) = 10 * 2 = 20 chupa