The formula for calculating Percent decrease

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Percent Decrease:
Example:
The price of book decreased from $12 to $10. What is the percent decrease in the price?
Solution: The price decreased from $12 to $10 i.e., by $2.
$2 decrease on 12 is how much decrease on 100 i.e. per cent?
2 on 12 is how much per 100:
(2/12) × 100% = (1/6) × 100% = 16.66% Read, Understand and Rememeber easily Math formulas for school and entrance exams with perfect graphics and simple but succinct descriptions of the pictures at my Pinterest:
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