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

### Instruction:
Rick held a fundraiser and is figuring out who still owes money. He marked on a sheet how much everyone has promised to contribute, but he forgot to note how much some people had actually paid. Altogether, everyone has promised to contribute $400, and Rick has actually received $285.  Sally, Amy, Derek, and Carl all still owe money. Sally and Carl both owe equal amounts, Amy owes $30, and Derek owes half as much as Amy. How much, in dollars, do Sally and Carl each owe?

### Response:
 Kwa jumla, Rick anadaiwa $400 - $285 = $<<400-285=115>>115.
Derek ana deni nusu ya kiasi cha Amy, hivyo ana deni la $30 / 2 = $<<30/2=15>>15.
Hii inamaanisha kwamba Sally na Carl wana deni la jumla ya $115 - $30 - $15 = $<<115-30-15=70>>70.
Kwa kuwa wana deni sawa, basi kila mmoja wao ana deni la $70 / 2 = $<<70/2=35>>35.