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It is surprising to see that so many of junior and mid management people struggle with percentages. Percentage for all practical purposes is the most widely used mathematical term in the corporate world. Margin, attrition, cost savings are all indicated in %ages. In this short article I will lay down some extremely simple tips that should help you to do some quick calculations around % ages.

Tip 1

How to calculate x% increase over a current number say “y”.

Scenario 1

If x is a number less than 10 i.e between 1 to 9

Then the EASIEST way to do it is to multiple the current number “y” by “1.0x”.

Example 1 : What is a 3 % increase over 100 = 100 x 1.03 =103

Example 2 : What is a 7 % increase over 3056 = 3056 x 1.07 = 3269.92

Scenario 2

If x is a number more than 9

Then the EASIEST way to do it is to multiple the current number “y” by “1.x”.

Example 1 : What is a 20 % increase over 100 = 100*1.20= 120

Example 2 : What is a 37 % increase over 2345= 2345*1.37= 3212.65

 

Tip 2

How do I calculate a discount of x% over a current number y

The EASIEST way to do this is to

Step 1 – ¬†Subtract “x” by 100. Let us assume the result is “z”.

Step 2 – Then multiply “y” by “0.z”

Example 1 : What price will I need to pay for a shirt worth 1000 if there is a discount of 25% on it

Step 1 – 100-25=75

Step 2 -1000 x 0.75=750

Example 2 : At what price will I need to see that product worth 4500 if I have to give a 5 % discount?

Step 1 – 100-5=95

Step 2 Р4500 x 0.95 =  4275

Hope this helps