The rate of wheat increased by 25%. How many percent may the use of wheat be reduced so that the expenditure on that item remains the same?

In an examination in which full marks were 700, A gets 20 % more than B, B gets 20 % more than C, and Cgets 15 % less than D. If A got 576 marks, then what percentage of full marks did D get? 

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

A man spends $$ {2\over3}rd$$ 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 A’s income is 40 % less than that of B, how much percent B's income is more than that of A? 

In a school, if there are 36% boys and 352 girls, then the number of boys is ________.

15% of 45% of a number is 105.3 What is 24% of that number?

When the price of an audio system was reduced by 20%, the sale increased by 80%. What was the net effect on the sale?