I would like to see the calculations to learn.........The price earnings ratios for $4$ public companies are: $5\mathrm{.}2,4\mathrm{.}6,3\mathrm{.}4,4\mathrm{.}86.$ The after$-$tax capitalization

rate is:

a$.16\mathrm{.}00\%$

b$.18\mathrm{.}08\%$

c$.20\mathrm{.}19\%$

d$.22\mathrm{.}15\%$