3. For the cash flows shown, determine: (a) the number of possible i* values (b) the i* value displayed by the IRR function. (c) the external rate of return using the MIRR method if i, = 18% per year and is = 10% per year. Year Revenue, $ Cost, S 0 0 -6,000 1 25,000 -30,000 2 19,000 -7,000 3 4,000 -6,000 28,000 -12,000