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

### Instruction:
 一本书比一张CD贵4美元。这张CD比一张20美元的专辑便宜30%。这本书的价格是多少？


### Response:
 这张CD比专辑便宜30/100 * 20 = 6美元。
所以它的价格是20 - 6 = 14美元。
这本书比CD贵4美元，所以它的价格是14 + 4 = 18美元。