Respuesta :
Answer: So, en 2015 the population is 321 mill, and the prediction is it will increase to 438 mill in 2050.
If the projection is true, we can see that the relation between these numbers is 438/321 = 1.364
this means that the population in 2050 is 1.364 times the population in 2015. In percentage, the population in 2050 is 136.4% of the population in 2015, so the increment in population is 36.4%.