If a book is sold at 9% profit instead of 9% loss, it would have brought Rs 9 more. Find out the cost price of the book	Choices:
A) 75 B) 72 C) 50 D) 70 E) 80

Rationale: let c . p . of the book be rs . ’ x ’ given , 1.09 x - 0.91 x = 9 = > 0.18 x = 9 = 9 / 0.18 = rs 50 answer : c
Answer: C