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

### Instruction:
Ali had a stock of 800 books in his Room. He sold 60 on Monday, 10 on Tuesday, 20 on Wednesday, 44 on Thursday and 66 on Friday. How many books were not sold?

### Response:
 Kwanza tunatazama idadi jumla ya vitabu vilivyouzwa: 60 + 10 + 20 + 44 + 66 = <<60+10+20+44+66=200>>200 vitabu.
Hivyo idadi jumla ya vitabu ambavyo havikuuzwa ni: 800 - 200 = <<800-200=600>>600 vitabu.