if a book is sold at 5 % profit instead of 5 % loss , it would have brought rs 13 more . find out the cost price of the book
"let c . p . of the book be rs . ’ x ’ given , 1.05 x - 0.95 x = 13 = > 0.1 x = 13 = 13 / 0.1 = rs 130 answer : c"
divide(multiply(const_100, divide(5, const_2)), 5)