5) A property owner must replace a roof this month at the cost of $30,000. He wants to put money aside to replace the roof at the end of its economic life in 20 years. Inflation is 2.75%. He can invest funds at 6.5%. How much must he put aside each month in order to replace the roof in 20 years? 6) In question 5, what is the process called and what type of function is it?