Mr. Bakhtiar works in the procurement department of a library. Under a new purchase policy, he increased the total number of books in the library by 20%. But soon afterwards, as part of the library cleaning process, 10% of the total library book stock is disposed of. What is the net change over the initial number of books in the library ?
A
increased of 10%
B
increased of 30%
C
decreased of 8%
D
none of these
Correct Answer: none of these