Q: If a number is increased by 20% and then decreased by 20%, what is the final value of the number?
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A
decreases by 4%
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B
increases by 4%
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C
decreases by 3%
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D
increases by 2%
A
Answer:
A
Explanation:
To solve this problem,
you can use the given values for x and y to calculate the net percentage change in value.
Here, x = 20 and y = -20.
Therefore, the net percentage change in value is:
(x + y + xy/100)%
= (20 - 20 + (20 * -20)/100)%
= (-4)%
Since the sign is negative, there is a decrease in value by 4%
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