The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: when the price of a product was decreased by 20 % , the number sold increased by 60 % . what was the effect on the total revenue ?
[EX A]: 28 %

[EX Q]: Problem: in a class of 32 students , 2 students did not borrow any books from the library , 12 students each borrowed 1 book , 10 students each borrowed 2 books , and the rest borrowed at least 3 books . if the average number of books per student was 2 , what is the maximum number of books any single student could have borrowed ?
[EX A]: 11

[EX Q]: Problem: what will be in unit ' s place digit of 3 to the power 34 .
[EX A]: