enigma123 wrote:
Of the 200 books a used-book store added to inventory last Monday, how many were sold by the end of the week?
(1) The 200 books added represented a 4 percent increase to the stores inventory.
(2) In the week between the addition of the 200 books and the end of the week, the stores inventory decreased by 6 percent.
How come the answer is E and not A?
This is why I think it should be A
Let x be the number of books before 200 were added.
Total inventory (x+200).
200 = 0.04(x+200)
We can calculate x and the difference.
Statement B - doesn't give us any meaningful information.
The question is: how many
of the 200 books were sold. How can the answer be A, if (1) says nothing about sales at all?
Of the 200 books a used-book store added to inventory last Monday, how many were sold by the end of the week?(1) The 200 books added represented a 4 percent increase to the stores inventory --> Inventory on Monday = 5,200 (5,000+5,000*0.04=5,000+200=5,200). Not sufficient.
(2) In the week between the addition of the 200 books and the end of the week, the stores inventory decreased by 6 percent. Clearly insufficient.
(1)+(2) From (2) inventory decreased by 6%, hence the store sold 5,200*0.06=312 books, but we don't know how many out of those 312 were from 200 books added to inventory last Monday. Not sufficient.
Answer: E.