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

### Instruction:
 Donny anaokoa $15 Jumatatu, $28 Jumanne na $13 Jumatano. Alhamisi anatumia nusu ya akiba yake yote hadi sasa. Alitumia kiasi gani?


### Response:
 Donny anaokoa jumla ya $15+$28+$13 = $<<15+28+13=56>>56 kwa siku zote 3
Anatumia nusu ya akiba yake yote ambayo ni $56*(1/2) = $<<56*1/2=28>>28