Suptisree BiswasKnowledge Contributor
The population of city increase at the rate of 5% per annum. If the present population of the city is 185220, what was its population 3 years ago?
The population of city increase at the rate of 5% per annum. If the present population of the city is 185220, what was its population 3 years ago?
P = P0 (1 + R/100)^T
=> 185220 = P0 (1 + 5/100)^3
=> 185220 = P0 (21/20)^3
=> P0 = (185220 × 20 × 20 × 20)/(21 × 21 × 21)
=> P0 = 160000
Answer: 3 years ago its population was 160000.