A book store bought copies of a new book by a popular author, in anticipation of robust sales. The store bought 400 copies from their supplier, each copy at wholesale price y. The store sold the first 150 copies in the first week at 80% more than y, and then over the next month, sold a 100 more at 20% more than y. Finally, to clear shelf space, the store sold the remaining copies to a bargain retailer at 40% less than y. What was the bookstore’s net percent profit or loss on the entire lot of 400 books?	Select the correct option:
A) 30% loss
B) 10% loss
C) 10% profit
D) 20% profit
E) 60% profit
[[y(150)(1.8)+y(100)(1.2)+y(150)(0.6)]/400y] - 1   [50[(3)(1.8) + (2)(1.2) + (3)(0.6)] / (50)(8)] - 1   [(5.4 + 2.4 + 1.8)/8] - [8/8]   +1.6/8   +20%   answer is 20% profit
<result>D</result>
A book store bought copies of a new book by a popular author, in anticipation of robust sales. The store bought 400 copies from their supplier, each copy at wholesale price y. The store sold the first 150 copies in the first week at 80% more than y, and then over the next month, sold a 100 more at 20% more than y. Finally, to clear shelf space, the store sold the remaining copies to a bargain retailer at 40% less than y. What was the bookstore’s net percent profit or loss on the entire lot of 400 books?