19. -11 polnts RoltFM8 5.2.051 My Notes Ask Your Teacher According to a government department, the average weekly earnings of wage and salary workers who were not members of a union was $486 in 1990 and $728 in 2010 Determine approximately the average annual rate of increase in wages for these 20 years. (Round your answer to two decimal places.) Need Help? Read It Talk to a Tutor 20. +-1 points RolfFM8 5.2.056. My Notes Ask Your Teacher The Martinelli family sells some property obtained from an inheritance. How much should they invest at 7% compounded annually in order to have $29,000 in 8 years? (Round your final answer to two decimal places.) | Need Help? L..Reade. :toaTutor 21. -12 points RolIFM8 5.2.064 My Notes Ask Your Teacher The rental cost of office space increased 2% annually for the last 3 years. If the current cost is $25 per square foot, find the following. (Round your answers to the nearest cent.) (a) Find the cost 3 years ago (b) At the same rate of increase, find the cost 3 years in the future