5. Calculate the number of years that you need to double $5,000, if the yearly simple interest rate is 12% 6. A 3D printing machine will cost $75,000 ten years from now. What will this machine cost three years from now if i= 10%. 7. An investment of $3,000 today will give you $10,000 in 20 years. Another investment of $5,000 will give you $8,000 in 7 years. Which investment is better? 8. An operations manager in a high tech company located in Bemidji MN is looking to buy a machine that is worth $100,000. The company decided to get a loan with a $40,000 down payment. The company agreed to re- pay the loan in five years. If the interest is 10% per year, calculate the total cost of the machine including interest.. 9. Determine the present value P for the given cash flows in the table below. i = 10% per year