When the price of an article was reduced by 20% its sale

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

1. 44% increase
2. 44% decrease
3. 66% increase
4. 75% increase

Correct Option: A

Using Rule 5,
Required effect

=		80 - 20 -	80 × 20		%
			100

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