The following function gives the population of a town (in thousands of people), t years after it was founded: P(t) = 20(1 +el-t)-1 What is the instantaneous rate of change of the population, 6 years after the town was founded? Choose 1 answer: 0.06 people per year 0.06 thousand people per year 0.35 people per year 0.35 thousand people per year