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

### Instruction:
 Kitabu kina gharama $4 zaidi ya CD. CD ina bei ya 30% chini ya albamu ya $20. Kitabu kina gharama kiasi gani?


### Response:
 CD ina bei ya 30/100 * 20 = $<<30/100*20=6>>6 chini ya albamu.
Hii inamaanisha CD inagharimu sawa na bei ya albamu - 6 = $<<14=14>>14.
Hivyo kitabu kina gharama $4 zaidi ya CD, hii inamaanisha kinagharimu 14 + 4 = $<<14+4=18>>18.