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

### Instruction:
Jerry works five days a week as a waiter and earns a variable amount of tips every night. The past four nights, he earned $20, $60, $15, and $40. How much does he need to earn tonight if he wants to make an average of $50 in tips per night?

### Response:
 Katika siku nne zilizopita, Jerry alipata jumla ya $20 + $60 + $15 + $40 = $<<20+60+15+40=135>>135.
Ili kupata $50 kwa usiku, anahitaji kupata $50 x 5 = $<<50*5=250>>250 kwa siku tano.
Hivyo usiku wa leo, Jerry anahitaji kupata $250 - $135 = $<<250-135=115>>115.