SSC CPO Tier 1 Exam 28 June 2024 Shift 3

A solid metal cylinder of 12 cm height and 7 cm radius is melted and recast into two cones in the proportion of 1 : 2 (volume), keeping the height 12 cm . What would be the percentage change in the flat surface area before and after [use $\mathit{\pi }=\frac{22}{7}$] ?