The price of a Maruti car rises by 30% while the sales of the car come down by 20%. What is the percentage change in the total revenue?  Choose the correct choice from the following answers:
A) -4% B) -2% C) +4% D) +2% E) None of these
Explanation :   Let initial price of Maruti car be Rs. 100.   As price increases 30%, the price of car become 100 + 30% of 100 = Rs. 130.   Due to increase in price, sales is down by 20 %.   It means, it is going to make 20% less revenue as expected after increment of price.   So, new revenue = 130 - 20 % of 130 = Rs 104.   The initial revenue was Rs 100 which becomess Rs 104 at the end.   It means there is 4% increment in the total revenue.   Answer : +4%
<result>C</result>
The price of a Maruti car rises by 30% while the sales of the car come down by 20%. What is the percentage change in the total revenue?