Rules of percentage
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you have to turn a percentage into a decimal, just divide by 100. For example, 25% = 25/100 = 0.25. To change a decimal into a percentage, multiply by 100. So 0.3 = 0.3 × 100 =30% .
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Percentages: Formulas, Tricks and Shortcuts
Percent implies “for every hundred”. ...
To calculate p % of y. ...
To find what percentage of x is y: y/x × 100.
To calculate percentage change in value. ...
Percentage point change = Difference of two percentage figures.
Increase N by S % = N( 1+ S/100 )
Decrease N by S % = N (1 – S/100)
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