4. Your cousin plans to purchase a new truck for $55,000, and with that truck will be able to earn an additional $7650 per year for 8 years. What is the highest interest rate your cousin can afford to pay in order for this additional revenue to balance out the expense of the truck? (Note: use the MS Excel method Sum of the PV of Amount = 0, and include the .xlsx file in your submission to Blackboard. You may use the =RATE() function to check your work, but that cannot be the only way you solve this problem.)