Percentages


Converting

Converting percentages to fractions - the number over 100
Converting percentages to decimals - divide by 100
Converting decimals to percentages - multiply by 100


Quick Percentages

PercentageDecimalFraction
1%0.011/100
2%0.022/100
3%0.033/100
5%0.055/100
10%0.110/100
20%0.220/100
50%0.550/100
75%0.7575/100
90%0.990/100
100%1.0100/100

Calculating Percentage Increase

A = Amount AfterwardsB = Amount BeforeP = Percentage Change
A = B * (1 + P)B = A / (1 + P)P = (A - B) / B
salary is B increased by P%salary is increased by P% to Asalary was B is now A (A > B)
P% more than B B increased to A
B plus P%  

Calculating Percentage Decrease

A = Amount AfterwardsB = Amount BeforeP = Percentage Change
A = B * (1 - P)B = A / (1 - P)P = (B - A) / B
salary is B decreased by P%salary is decreased by P% to Asalary was B is now A (B > A)
P% less than B B decreased to A
B minus P%  


Compound Percentages - Increase

This is when there are two percentage increases


Compound Percentages - Decrease

This is when there are two percentage decreases


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