A tree increases annually by 1/8 th of its height. By

A tree increases annually by 1/8 th of its height. By how much will it increase after 2 years, if it stands today 64 cm high ?

Increase% = (1/8) x 100% = 12.5%
Height after 2 years =64 x {1 +25/(2 x 100)}²
= 64 x 9/8 x 9/8
= 81 cm