Can someone please explain how to do these on a financial calculator? I have my final tomorrow.

Question 10 1 pts A new security system has a price-tag of $8,000, but should save your company $3,600 each year for the next 10 years in reduced thefts. What is the profitability index of the security system? Use a discount rate of 10.7%. O 2.51 0 2.42 2.79 2.68 2.33 Question 11 1 pts You have purchased a canning machine for $7,000. You expect the machine to save your company $3,775 each year for the next 10 years. What is the profitability index of the machine? Use a discount rate of 10.9%. 3.19 3.49 3.41 3.07 3.25