If the price of a book is first decreased by 25% and then increased by 20%, then the net change in the price will be:

If the interest on Rs. 800 exceeds that on Rs. 600 by Rs. 15.50 in 6 months, find the rate percent p.a.

If 20% of a = b, then b% of 20 is the same as:

The number which exceeds 16 % of by 42 is:

40% of 5/6 is

A 6% stock yields 8%.The market value of the stock is

By mixing two brands of tea and selling the mixture at the rate of Rs. 177 per kg, a shopkeeper makes a profit of 18%. If to every 2 kg of one brand costing Rs. 200 per kg. 3 kg of the other brand is added, then how much per kg does the other band cost?

If A sells at a profit of Rs.2 per apple and B sells apples at a loss of Rs.2 per apple, such that at the end of the day, the net profit percentage of A is equal to the net loss percentage of B and the quantity of apples sold by each are the same their net profit or loss percentage is :

In a city, 40% of the people are illiterate and 60% are poor. Among the rich, 10% are illiterate. What percentage of the poor population is illiterate?

At what rate percent per annum will the simple interest on a sum money be 2/5 of the amount in 10 years?