If Renee earns a raise of between 5% and 10%, non-inclusive, by what fraction could her salary have increased?  Choose the correct choice from the following answers.
A) 1 / 4  B) 1 / 5  C) 1 / 10  D) 2 / 25  E) 1 / 20

Rationale: 5 % is 5 / 100 = 1 / 20 10 % is 10 / 100 = 1 / 10 the increase must be greater than 1 / 20 and less than 1 / 10 . 1 / 4 , 1 / 5 , and 1 / 10 are not less than 1 / 10 . 1 / 20 is not greater than 1 / 20 . the only option left is 2 / 25 , which is in the specified range . answer : d
Answer: D