Let the population of a town be P now and suppose it increases at the rate of R% per annual, then :
Population after n years = P(1 + R / 100)^{n}
Population n years ago = P / (1 + R / 100)^{n}
Result on Depreciation
Let the present value of a machine be P. Suppose it depreciates at the rate of R% per annual, then :
Value of the machine after n years =P (1 – R / 100)^{n}
Value of the machine n years ago = P / (1 – R / 100)^{n}
If A is R% more than B, then B is less than A by [R / (100 + R) x 100]%
If A is R% less than B, then B is more than A by [R / (100 – R) x 100]%
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1. What is percentage? 
2. How do you calculate percentage increase or decrease? 
3. How can I calculate a percentage of a number? 
4. What is the difference between percentage and percentile? 
5. How do you calculate the percentage of increase or decrease between two numbers? 
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