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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 ii=18% per year and ii=10% per year. The number of i " values according to the rule of signs test is According to the cumulative cash flow sign test, i value is The IRR function displays i value as 0%. The external rate of return according to the MIRR method is