The cash difference between the selling prices of an book at a profit of 5% and 10% is $3. The ratio of the two selling prices is:	Choose the correct answer:
A) 21:22 B) 52:33 C) 52:53 D) 45:53 E) 51:34
Let C.P. of the book be $x.   Then, required ratio = 105% of x / 110% of x   = 105/110 = 21/22 = 21:22   21:22
<result>A</result>
The cash difference between the selling prices of an book at a profit of 5% and 10% is $3. The ratio of the two selling prices is: