On my sister's birthday, she was 126 cm in height, having grown 5% since the year before. How tall was she the previous year?
Answers.
A) 124 cm  B) 120 cm  C) 116 cm  D) 112 cm  E) 110 cm

Rationale: let the previous year ' s height be x . 1.05 x = 126 x = 120 the answer is b .
Answer: B