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 $i_i=18\%$ per year and $i_b=10\%$ per year.

The number of $i^{**}$ values according to the rule of signs test is $($Click to select$)vv.$

According to the cumulative cash flow sign test, $i^{**}$ value is

The IRR function displays $i^{**}$ value as

$\%.$

The external rate of return according to the MIRR method is

$\%.$