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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Correct Answer: 6.25% decrease
Solution : Given: First percentage change ($x$) = 25% increase Second percentage change ($y$) = 25% decrease On putting the value of $x$ and $y$ in the equation, Net percentage change $=25 - 25 - \frac{25\times 25}{100}$ $= - \frac{625}{100}\%$ $=-6.25\%$ Hence, the correct answer is a 6.25% decrease.
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Question : If the price of a book first increased by 18% and then decreased by 18%. What is the net change in the price of the book?
Option 1: 18% increase
Option 2: 3.24% decrease
Option 3: No change
Option 4: 18% 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 : A number is increased by 20% and then decreased by 20%. What is the net percent change in the number?
Option 1: 4% increase
Option 2: 4% decrease
Option 3: 5% increase
Option 4: 5% 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
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