In the town of Big Sky, Montana in the year 2006 the population of the town was 21,000 and the population was increasing by a rate of 900 people per year. Also, in that year, the average annual income per capita was S37,000 and this average was increasing at a rate of $1,500 per year. Find the rate at which the total personal income in the town is increasing in the year 2006. $ Preview