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

### Instruction:
Kate wants to buy a special pen as a gift for her friend. The pen costs $30, and Kate only has money for a third of that amount. How much more money does she need to buy the pen?

### 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.