On my sister's 15th birthday, she was 159 cm in height, having grown 6% since the year before. How tall was she the previous year? Choices
A) 150 cm  B) 140 cm  C) 142 cm  D) 154 cm  E) None of these
Explanation :   Given that height on 15th birthday = 159 cm and growth = 6%   Let the previous year height = x   Then height on 15th birthday = x ×100+6/100=x×106/100   ⇒159 = x × (106/100)   ⇒�x=159×100/106=1.5×100=150;cm   150 cmnswer : Option 150 cm
<result>A</result>
On my sister's 15th birthday, she was 159 cm in height, having grown 6% since the year before. How tall was she the previous year?