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

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? 

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? 

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

if 50% of (x-y) =30% of (x+y), then what percentage of x is y?

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

If "basis points" are defined so that 1 percent is equal to 100 basis points, then by how many basis points is 82.5 percent greater than 62.5 percent.