Question

The population of a country increases by 7% in each 10 years. If the present population be 4007150 then what was the population 20 year ago.

Answer 1

Answer:

3.5 million or 3500000.

Step-by-step explanation:

10 years -> 7% increase

100% + 7% = 107%

107% population = 4007150

1% population = 4007150 / 107 = 37450.

100% population = 37450 x 100 = 3745000. (10 years ago)

20 years - 10 years = 10 years

10 years -> 7% increase

100% + 7% = 107%

107% population = 3745000

1% population = 3745000 / 107 = 35000

100% population = 35000 * 100 = 3500000. (20 years ago.)