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

### Instruction:
 Matilda alinunua simu ya mkononi kwa $300. Kisha akaamua kwamba hangeweza kutumia na akaiuza kwa $255. Asilimia ngapi ya gharama ya awali alipoteza?


### Response:
 Tofauti kati ya gharama ya awali na kiasi alichouza simu ni $300-$255 = $<<300-255=45>>45
$45 ni (($45/$300)*100)=<<45/300*100=15>>15% ya $300