The ratio of coins of 50 paisa, 25 paisa, and 10 paisa is 4:3:2. Find the total amount if the number of coins is 90.

A man spends of his income. If his income increases by 14 % and the expenditure increases by 20%, then the percentage increase in his savings will be

If the length of a rectangle increases by 50% and the breadth decreases by 25%, then what will be the percent increase in its area?

The number obtained by subtracting two-third of 75% of 600 from a number is 320, what is the original number?

Atul divides some money among his three children A, B and C. The ratio of amount received by A and C together to the amount received by B is 5:2. C received 150% of the amount received by A. If the amount received by C is Rs. 1500. Find the sum of amount received by A and B together. 

Ram sells two articles, each for the same price Rs.720. He incurs 20% loss on the first and 10% loss on the second. Find his overall percent loss.

The cost of an article was 75. The cost was first increased by 20% and later on it was reduced by 20%. The present cost of the article is:

A student multiplies a number by 5/3 instead of 3/5. What is the percentage error in the calculation?