Data Interpretation Practice Test 2

Let x = number of questions in Bank PO test.
then 2x = number of questions in both Bank PO and NDA test.
According to the graph,
8% of x = number of Mathematics questions in Bank PO test
4% of 2x = number of English questions in NDA test
But (.08)(x) = (.04)(2x), so there is no difference in the number of questions asked, i.e., a 0% increase.