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

A `72 cm` 
B `74 cm` 
C `75 cm` 
D `81 cm` 

+ Answer
D 

+ Explanation
Increase` %= (1/8 xx 100) %`

`= 12 1/2%`


Hight after `2` years 

`= [ 64 xx (1 + 25/(2 xx 100))^2] cm`

`= (64 xx 9/8 xx 9/8) cm`

`= 81 cm`

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Irin Moni

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