Question

A tree grows at the rate of 1/5th of its height annually. By how much height will it grow after 2 years, if its present height is 75 cms? 

Options

• 108 cms 

• 90 cms 

• 144 cms

• 112 cms

Answer 1

108 cms

Explanation:

Rate of grow `= 100/5` = 20 %

time t = 2 years

Height of the tree after 2 years

`= 75 xx (1 + 20/100)^2`

= 75 × 1.44 = 108 cm