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

If the length of a rectangle is increased by 20% and its breadth is decreased by 20%, its area:

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.

Two candidates contested an election. One of them got 64% of the votes and won by 434 votes. What was the total number of votes polled? 

The price of sugar is increased by 20%. As a result, a family has to decrease its consumption by 20%. The expenditure of the family on sugar is decreased by

A is 80% more than B and C is $$48{4\over 7}\%$$ less than the sum of A and B. By what percent is C less than A?

If (x+20)% of 250 is 25% more than x% of 220, then 10% of (x + 50) is what per cent less than 15% of x?

B is 10% more than A. C is 20% less than A. B is what percentage more than C?