A project with the following costs are under consideration to determine its profitability. Using the IRR comparison, and an annual MARR of $10\%$ compounded semiannually, determine if the project should be executed.

First cost

:$$46,600$

Semiannual operating cost $,$:$$10,000$

Semiannual income $,$:$$20,000$

Salvage value :$$20.\mathrm{.}000$

Life in years

:$4$ years

a$.$ IRR $=18\mathrm{.}70$ semiannual

b$.$ IRR $=16\mathrm{.}96$ semiannual

C$.$ IRR $=18$ semiannual

d$.$ IRR $-15\mathrm{.}836$ semlannual