g=growth rate

t=number of years

The formula would be:

P(1+g)^t

where “^t” means “raised to the t power”

100,000,000(1+0.035)^40 = 395,925,972.12 (rounded to the hundreth)

But of course, you cannot consider a 12/100 being to be a person, so the better answer would be 395,925,972.

You take the figure 100,000,000 (the one hundred million), and ADD 3.5% which totals 103,500,000 (or 3 1/2 million more people the first year). You can then take this figure and add 3.5% to each year’s total. After I got the first year’s total, using a calculator, I just hit the EQUALS key another 39 times (which adds it automatically for you) and came up with a final total population of 240 million people.

100,000,000 + 3.5%=103,500,000 (first year), keep adding 3.5% to each year’s total