If the sales tax be reduced from $$ 3{1\over2}$$ % to $$ 3{1\over3}$$%, what difference does it make to person who purchases an article whose marked price is Rs.8400? 

In a town, 60% of the total voters is male and the rest are females. If 60% of the males are literate and 70% of the females are literate, then by what percent is the number of literate males more than that of illiterate females?

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

Two students appeared for an examination. One student who scored 20 marks more than the other, his score was 60 % of the sum of their marks. What was his score?

Answer the following questions

Manoj gave 60% of his salary to his wife and invested rest amount in mutual funds. His wife spends 30% amount on grocery and 20% on rent. From remaining amount, she purchased gold worth Rs. 18000. Find salary of Manoj.

The monthly income of a person was ₹ 13,500 and his monthly expenditure was ₹ 9,000. Next year his income increased by 14% and his expenditure increased by 7%. The per cent increase in his savings was  

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.

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?