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

### Instruction:
 Greg amemkopesha dada yake Tessa pesa mara kadhaa. Greg anaandika deni zote za dada yake katika daftari, mara ya kwanza alimkopesha $40. Baada ya wiki moja, Tessa alimlipa nusu ya deni lake. Siku chache baadaye, alimwomba $10 zaidi. Tessa bado anamdai Greg kiasi gani?



### Response:
 Baada ya Greg kumkopesha $40, Tessa alimlipa $40 / 2 = $<<40/2=20>>20.
Hivyo, deni la Tessa kwa Greg lilikuwa $40 - $20 = $<<40-20=20>>20.
Hatimaye, alimwomba $10 zaidi, hivyo deni likabaki $20 + $10 = $<<20+10=30>>30.