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

### Instruction:
Robert, a sales agent, earns a basic salary of $1250 per month and,  10% commission on his monthly sales. Last month, his total sales were $23600. He allocated 20% of his total earnings to savings and the rest of the money to his monthly expenses. How much were his monthly expenses last month?

### Response:
 Robert alipata $23600 x 10/100 = $2360 kutoka kwa tume.
Hivyo, alipata jumla ya $1250 + $2360 = $3610 mwezi uliopita.
Kwa kuwa alihifadhi $3610 x 20/100 = $722, basi matumizi yake yote mwezi uliopita yalikuwa $3610 - $722 = $2888.