Final answer:
The population will be approximately 231,549 in 12 years.
Step-by-step explanation:
To find the population in 12 years, we need to calculate the exponential growth using the formula P = P0(1+r)t, where P0 is the initial population, r is the growth rate as a decimal, and t is the number of years. In this case, P0 = 57000, r = 15% = 0.15, and t = 12. Plugging in these values, we get P = 57000(1+0.15)12. Evaluating this expression, the population will be approximately 231,549 in 12 years.