Data related to number of books purchased be two Libraries (A and B) during 6 yr Number of books purchased for library B is what per cent of the number of books purchased for library A in 2006?
A) 30%
B) 35%
C) 55%
D) 85%
E) 45%
Correct Answer: D
$ \therefore $ Required percentage $ =\frac{680}{800}\times 100=85 $ %