Calculate the intrinsic value of Rio Tinto in each of the following scenarios by using the three$-$stage growth model of Spreadsheet $18\mathrm{.}1.$ Treat each scenario independently.

a$.$ The terminal growth rate will be $6\%.$

b$.$ Rio Tinto$$s actual beta is $1\mathrm{.}2.$

c$.$ The market risk premium is $7\mathrm{.}5\%.$