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

### Instruction:
Troy is thinking of buying a new computer that is worth $80. He has initially saved $50 and plans to sell his old computer for $20. How much more money does he need so he could buy the new computer?

### Response:
 Troy ana $50 + $20 = $<<50+20=70>>70 kutoka akiba yake na mauzo ya kompyuta yake ya zamani.
Hivyo, bado anahitaji $80 - $70 = $<<80-70=10>>10 zaidi ili kununua kompyuta mpya.