Car Dealership X, the total profit from sales increased by 9 percent over the previous years, while the number of cars sold decreased by 9 percent over the previous years. Approximately what was the average percent increase in profit per car over the previous year.  Choose the correct answer:
A) 18%
B) 19.78%
C) 22%
D) 23%
E) 25%
Let Profit be x and cars sold be y   Originally Profit/Car = x/y   Now it is 1.09x / 0.91 y = 109/91 (x/y)   Increase in profit per car = ((18/91) (x/y)) / (x/y) * 100 = 19.78%   Answer = 19.78%
<result>B</result>
Car Dealership X, the total profit from sales increased by 9 percent over the previous years, while the number of cars sold decreased by 9 percent over the previous years. Approximately what was the average percent increase in profit per car over the previous year.