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

### Instruction:
 詹姆斯打印了2本书。每本书有600页。他双面打印，每张纸上有4页。他用了多少张纸？


### Response:
 他打印了2*600=<<2*600=1200>>1200页。
每张纸上有4*2=<<4*2=8>>8页。
所以他用了1200/8=<<1200/8=150>>150张纸。