Question

s0lve...

Answer 1

12.5 million

Answer 2

it doubles every 7 days it means it doubles 3x.
1.56 x 2 x 2 x 2 = 12.48 (12.5) which means A is the correct answer cux the population exceed 12.5.

For verifying; you can do four redoubles 1.56 x 2 x 2 x 2 x 2 which will exceed 25 M.

Answer 3

Well it should come out to less than 12.5million in 23 days with a doubling of 1.56 every 7 days, so..

Answer 4

1.56*2=3.12 million in 7 days
3.12*2=6.24 million in 14 days
6.24*2=12.48 million in 21 days
so it will cross 12.5 million in 23 days