A store reduces the price of 1 product by 20%. How many % do you need to raise to the % to get the original price.
25%
A percentage decrease and the increase needed to undo it are measured on different bases, so they are not equal. Let the original price be 100.
Reduced price = 100 - 20% of 100 = 80.
Required increase = 20 on a base of 80
Percentage increase = (20/80) × 100
= 25%
Check: 80 + 25% of 80 = 80 + 20 = 100, the original price.
Hence, 25%.
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