If the length of a rectangular plot of land is increased

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If the length of a rectangular plot of land is increased by 5% and the breadth is decreased by 10%, how much will its area increase or decrease ?

1. 6.5% increase
2. 5.5% decrease
3. 5.5% increase
4. 6.5% decrease

Correct Option: B

Using Rule 10,

Net % effect =		x - y -	xy		%
			100

=		5 - 10 -	5 × 10		%
			100

= (–5 – 0.5)% = – 5.5%
The negative sign shows decrease.