static void Main$()$

$\{$

double days,books;

Console.WriteLine$("$Enter the number of books"$)$;

books $=$ double.Parse$($Console$.$ReadLine$())$;

Console.WriteLine$("$Enter the number of days"$)$;

days $=$ double.Parse$($Console$.$ReadLine$())$;

$//$ Here we call the DisplayFine method with the help of the class name so that the method is accesible

FineForOverdueBooks.DisplayFine$($books$,$days$)$;

$\}$

public static void DisplayFine$($double books,double days$)$

$\{$

double fine$=0$;

if$($days$<=7)$

fine$=$days$*$books$*\mathrm{.}10$;

else

fine$=$books$*(\mathrm{.}70+($days$-7)*\mathrm{.}20)$;

Console.Write$("$The fine for $\{0\}$ book$($s$)$ for $\{1\}$ day$($s$)$ is $\{2\}",$ books, days, fine.ToString$("$C$"))$;

$\}$

$\}$