Calculate the Black$-$Scholes option price in each of the cases that follow. The risk$-$free rate and standard deviation are quoted in annual terms.

$\backslash$table$[[$Stock$,$Brercise,Risk$-$Free,,$],[$Price$,$Price,Rate,Maturity,Deviation$],[$$$21,$$$25,8\%,3$ months,$\mathrm{.}20],[$$$26,$$$20,2\%,6$ months,$\mathrm{.}15],[$$$60,$$$40,11\%,9$ months,$\mathrm{.}25],[$$$64,$$$65,7\%,12$ months,$\mathrm{.}30],[$$$80,$$$70,3\%,3$ years,$\mathrm{.}35]]$