The price of Maruti car rises by 30 percent while the sales of the car come down by 20%. What is the percentage change in the total revenue? Choose one:	A) - 4%	B) - 2%	C) + 4%	D) +2%	E) None of these
Solution: Let initial price of Maruti Car be Rs. 100.   As price increases 30%, price of car will become, (100 +30% of 100) = Rs. 130.   Due to increase in price, sales is down by 20%. It means, it is going 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 becomes Rs. 104 at the end. It means there is 4% increment in the total revenue.   Mind Calculation Method:   100==30%↑(price effect)==&gt;130==20%↓(sales effects)==&gt;104.   Hence, 4% rises.   Answer: Option + 4%
<result>C</result>
The price of Maruti car rises by 30 percent while the sales of the car come down by 20%. What is the percentage change in the total revenue?