A population of simploids has 400 individuals. after 3 years, this population has had 250 births and 170 deaths, so the population has grown to 480 individuals. what is the approximate yearly growth rate, r, of this population?

To find the approximate growth rate, take the rate after 3 years (480) and divide it by the number of years passed (3). This gives values of 480 - 400, or 80, divided by 3, or approximately 26.67 individuals added to the population per year, or 27 per year if the value is rounded to the nearest individual.