The function P(x)=11e.00731x represents the population in millions of a small country in 1960. To find the population in 2020, we need to find the value of P(60), since 2020 - 1960 = 60. Using a calculator, we get:
P(60) = 11e.00731(60) ≈ 24 million
Therefore, the population in 2020, rounded to the nearest whole number, using this model, is about 24 million.