Question

The length of a square is increased by 15% and breadth decreased by 15%. The area of the rectangle so formed is

Options

• neither increases nor decreases

• decreases by 2.25%

• increases by 2.25%

• decreases by 22.5%

Answer 1

decreases by 2.25%

Explanation:

When length and breath are increased and decreased respectively. By 15% net effect on it area

`=15-15-(15xx15)/100` ........`["x"-"y"-("xy") /100]`

 = − 2.25%

i.e. decrease by 2.25%