When the price of an article was reduced by 20% its sale increased by 80%. What was the net effect on the revenue?
Let's initial price is $$x$$, and sale is $$y$$ so revenue will be $$xy$$
After having discount of 20%, initial price will be $$\frac{80x}{100}$$ and sale will be $$\frac{180y}{100}$$ , hence new revenue is $$1.44xy$$.
Increment in revenue will be $$0.44xy$$ i.e. equal to 44%
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