Quantitative Aptitude - Arithmetic Ability Questions

If by selling an article for Rs. 390 a shopkeeper gains 20% , then the cost is

The selling price of an item inclusive of a 10% profit was Rs.440. What would be the percentage loss if the item was sold for Rs. 370?

A librarian purchased 60 story books for his library. But he found that he could get 4 extra books by spending Rs 336 more and then the overall average price per book would be reduced by Re 1. The previous average price of each book was

The effective annual rate of interest corresponding to a nominal rate of 15% per annum payable half-yearly is

If a+1a2 = 3, then the value of  a3+1a3 is

The first and last terms of an arithmetic progression are 37 and ­18. If the sum of the series is 114, then it has how many terms?

sinA/(1 + cos A) is equal to

If A, B and C are denoting Mean, Median and Mode of a data and A : B = 9 : 8. Then the ratio of B : C is