Answer:
66% of the books were still not sold.
Step-by-step explanation:
1. you add all the books sold together and get 408.
2. you put 408 / 1200.
3. divide 1200 but 100 and get 12.
4. then you divide 408 by 12 and get the percent of books sold.
5. subtract the number of books sold from 100 and you get 66% are unsold