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

### Instruction:
 Kate anataka kununua kalamu maalum kama zawadi kwa rafiki yake. Kalamu hiyo inagharimu $30, na Kate ana pesa za thuluthi ya kiasi hicho tu. Anahitaji pesa ngapi zaidi kununua kalamu hiyo?


### Response:
 Kwa sasa, Kate ana pesa za 1/3 * $30 = $<<1/3*30=10>>10.
Hii inamaanisha Kate anahitaji $30 - $10 = $<<30-10=20>>20 zaidi kununua kalamu hiyo.