A trader marked the selling price of an article at 11% above the cost price. At the time of selling, he allows certain discount and suffers a loss of 1%. He allowed a discount of :	Pick:
A) 10 % B) 10.5 % C) 9.9 % D) 12.5 % E) none

Rationale: "sol . let c . p . = rs . 100 . then , marked price = rs . 110 , s . p . = rs . 99 . ∴ discount % = [ 11 / 111 * 100 ] % = 9.9 % answer c"
Answer: C