Question

A tree grows annually by one-eighth of its height. By how much will it grow after 2 years, if it stands today 64 cm high?

• A. 72 cm
• B. 74 cm
• C. 75 cm
• D. 81 cm

Answer 1

The correct option is D 81 cm

Present height of tree=64cm
It grow annually by one-eighth of its height
Then it grow in first year=$\frac{1}{8}\times 64=8cm$
Then total height=$64+8=72$
In second year it grow =$\frac{1}{8}\times 72=9cm$
then total height after 2 year=$72+9=81cm$