A man sold 18 toys for Rs. 16800, gaining thereby the cost price of 3 toy find the cost price of a toy	Choose the correct choice from the following answers.
A) rs . 600 B) rs . 800 C) rs . 500 D) rs . 900 E) rs . 970

Rationale: "let the cost of one toy = x . then , cost of 18 toys = 18 x . gain = 3 x . sp of 18 toys = rs . 16800 . gain = sp – cp 3 x = 16800 – 18 x 21 x = 16800 x = rs . 800 . answer : b"
Answer: B