2. In 2015, the estimated population of South Sudan was 11.5 million with a relative growth rate of 1.025%. (a - 4 pts., 6-2 pts.) a. Write an equation that models the population growth in South Sudan, letting 2015 be year 0. 2. In 2015, the estimated population of South Sudan was 11.5 million with a relative growth rate of 1.025%. (a - 4 pts., 6-2 pts.) a. Write an equation that models the population growth in South Sudan, letting 2015 be year 0