Question:The length of a rectangle is increased by `20%` and the width is decreased by `20%`. The area decreases by : 

A `0.8%` 
B `1.2%` 
C `4%` 
D `8%` 

+ Answer
C 

+ Explanation
`Let∕`= 10 m & b = 10 m.

Then, area`= 100 m^2`

New length`= 120% of 10 = 12 m.`

New breadth`= 80% of 10 = 8 m`.

New area`= (12 xx 8) m^2`

`= 96 m^2`

Decrease`= 4%`.

+ Report

Irin Moni

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