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

### Instruction:
John earned $18 on Saturday but he only managed to earn half that amount on Sunday. He earned $20 the previous weekend. How much more money does he need to earn to give him the $60 he needs to buy a new pogo stick?

### Response:
 Mwishoni mwa wiki iliyopita, John alipata $18 Jumamosi + $20 Jumapili = $<<18+20=38>>38
Mwishoni mwa wiki hii, John alipata $18 Jumamosi / 2 = $<<18/2=9>>9 Jumapili
Hii inamaanisha kuwa katika wiki mbili, John amepata $38 + $9 = $<<38+9=47>>47
Hivyo, bado anahitaji $60 - $47 = $<<60-47=13>>13 zaidi kununua kifaa cha kuchezea pogo.