On my sister's birthday, she was 154 cm in height, having grown 10% since the year before. How tall was she the previous year?  Choose the correct choice
A) 150 cm  B) 140 cm  C) 142 cm  D) 148 cm  E) 146 cm

Rationale: "let the previous year ' s height be x . 1.1 x = 154 x = 140 the answer is b ."
Answer: B