Question : When the price of an article was increased by 5% its sale reduced by 10%. What was the net effect on the revenue?
Option 1: 5% increase
Option 2: 5.5% decrease
Option 3: 5.5% increase
Option 4: 5% decrease
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Correct Answer: 5.5% decrease
Solution : Given: the price of an article was increased by 5% its sale was reduced by 10%. Let the price increase be $a$% and the sale reduction be $b$%, So, the net effect on revenue = $a-b-\frac{ab}{100}$ = $5-10-\frac{5×10}{100}$ = $-5-0.5$ = $-5.5$% A negative sign implies that revenue will decrease. Hence, the correct answer is 5.5% decrease.
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Question : When the price of cloth was reduced by 25%, the quantity of cloth sold increased by 20%. What was the effect on the gross receipt of the shop?
Option 2: 5% decrease
Option 3: 10% increase
Option 4: 10% decrease
Question : A number is increased by 5% and then the increased number is decreased by 5%. What is the net increase or decrease per cent?
Option 1: 0.25% decrease
Option 2: 0.75% increase
Option 3: 1% increase
Option 4: 0.50% decrease
Question : A number is increased by 20% and then the increased number is decreased by 20%. The net increase or decrease is:
Option 1: Decrease 2%
Option 2: Increase 4%
Option 3: Increase 2%
Option 4: Decrease 4%
Question : A number is increased by 30% and then the increased number is decreased by 30%. The net increase or decrease is:
Option 1: 12% increase
Option 2: 9% decrease
Option 3: 15% decrease
Option 4: 30% increase
Question : If the price of a washing machine is first increased by 25% and then decreased by 25%, then the net change in price will be a _____.
Option 1: 6.5% increase
Option 2: 6.5% decrease
Option 3: 6.25% decrease
Option 4: 6.25% increase
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