Percentage for Find= Population

 Percentage for Find Population

Equation on Increase Population 

[A] Population after N years :

P = Present Population

R = Rate Percent (%)

N = Number of Years

[B] Population N years Ago :

P = Present Population

R = Rate Percent (%)

N = Number of Years

Example : The population of a town is 176400. If it's increased at the rate of  5% per annum. Find it's population after 2 years & what was it's population 2 years ago.

Solution :     

Population after 2 years : Here, P = 176400, R = 5%, N = 2 Years.

 

Population 2 years Ago: Here, P = 176400, R = 5%, N = 2 Years.

Equation on Decrease Population

[A] Population after N years :

P = Present Population

R = Rate Percent (%)

N = Number of Years

[B] Population N years Ago :

P = Present Population

R = Rate Percent (%)

N = Number of Years

Example : The value of a machine depreciates at the rate of 10% per annum. If its present value is Rs.81000, What will be its worth after 3 years ? What was the value of the machine 2 years ago?

Solution :     

Population after 3 years : Here, P = 81000, R = 10%, N = 3 Years.

Population 2 years Ago :  Here, P = 81000, R = 10%, N = 2 Years.