The owner of a furniture shop charges his customer 20% more than the cost price. If a customer paid Rs. 8600 for a computer table, then what was the cost price of the computer table?  Pick one.
A) rs . 6289
B) rs . 6298
C) rs . 6290
D) rs . 7166
E) rs . 7708

Rationale: "cp = sp * ( 100 / ( 100 + profit % ) ) = 8600 ( 100 / 120 ) = rs . 7166 . answer : d"
Answer: D