Percentage Easy Questions and Answers

A number is increased by 10% and then it is decreased by 10%. The net change in the number is

Using Rule 4,
Net change

=		10 - 10 -	10 × 10		% = –1% = 1% decrease
			100

Using Rule 4,
Net change

=		10 - 10 -	10 × 10		% = –1% = 1% decrease
			100

A number is first increased by 10% and then it is further increased by 20%. The original number is increased altogether by

Using Rule 7,
Required percentage increase

=		10 + 20 +	10 × 20		% = 32%
			100

Using Rule 7,
Required percentage increase

=		10 + 20 +	10 × 20		% = 32%
			100

When the price of an article was reduced by 20% its sale increased by 80%. What was the net effect on the sale?

Using Rule 5,
Required effect

=		80 - 20 -	80 × 20		%
			100

= (60 – 16)% = 44%
Positive sign shows increase

Using Rule 5,
Required effect

=		80 - 20 -	80 × 20		%
			100

= (60 – 16)% = 44%
Positive sign shows increase

The length of a rectangle is increased by 10% and breadth decreased by 10% Then the area of the new rectangle is

Using Rule 7,
Net effect

=		x + y +	xy		%
			100

=		10 - 10 -	10 × 10		% = -1 %
			100

Negative sign shows decrease.

Using Rule 7,
Net effect

=		x + y +	xy		%
			100

=		10 - 10 -	10 × 10		% = -1 %
			100

Negative sign shows decrease.

When the price of cloth was reduced by 25%, the quantity of cloth sold increased by 20%. What was the effect on gross receipt of the shop?

Using Rule 5,
Required per cent effect

=		x + y +	xy		%
			100

=(–5 – 5)% = – 10%
Negative sign shows decrease

Using Rule 5,
Required per cent effect

=		x + y +	xy		%
			100

=(–5 – 5)% = – 10%
Negative sign shows decrease

Percentage