Percentage of profit earned by selling a book for $3360 is equal to the percentage loss incurred by selling the same book for $2640. What price should the book be sold to make 20% profit?  Choose the correct choice from the following answers:
A) $3600
B) $4000
C) $3500
D) $3700
E) $4000
Let C.P. be Rs. x.   Then,(3360 - x)	x 100 =(x - 2640) x 100   3360 - x = x - 2640   2x = 6000   x = 3000   Required S.P. = 120% of 3000 = 1.20	x 3000 = $3600   $3600nswer : $3600
<result>A</result>
Percentage of profit earned by selling a book for $3360 is equal to the percentage loss incurred by selling the same book for $2640. What price should the book be sold to make 20% profit?