Please do not use Excel to show the answer, thanks

7.35 Arc-bot Technologies, manufacturers of six-axis, electric servo-driven robots, has experienced the cash flows shown in a shipping department. (a) Determine the number of possible rate of return values. (b) Find all i* values between 0 and 100%. Year Expense, $ -33,000 -15,000 -40,000 -20,000 -13,000 Savings, $ 0 18,000 38,000 55,000 12,000