a person incurs 10 % loss by selling a watch for $ 100 . at what price should the watch be sold to earn 10 % profit ?
"let the new selling price be $ x ( 100 - loss % ) : ( 1 st s . p . ) = ( 100 + gain % ) : ( 2 nd s . p . ) ( 100 - 10 ) / 100 = ( 100 + 10 ) / x x = 110 * 100 / 90 = 122 approximately answer is b"
divide(100, subtract(const_1, divide(10, const_100)))