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

### Instruction:
Nate is reading a 400-page book. He finished reading 20% of the book. How many pages does he need to read to finish the book?

### Response:
 Nate alikuwa amesoma kurasa 400 x 20/100 = <<400*20/100=80>>80.
Hivyo, anahitaji kusoma kurasa 400 - 80 = <<400-80=320>>320 ili akamilishe kitabu.