convert String to Currency in C Sharp

I am trying to take the string input of TR and string PMP convert them into currency then multiply together to get an output in USD currency .

       string SP;  // Sales Price

       string TR;  //Total Revenue

       string PMP; //Property management percentage

       string PMF; //Property Management Monthly Fee


       Console.WriteLine("What is the total rent revenue?");
       TR = Console.ReadLine();
       Console.WriteLine("what is the percentage you pay to property managment?");
       PMP = Console.ReadLine();
       Console.WriteLine("you will be buying {0}", PMF );


        SP = Console.ReadLine();
        TR = Console.ReadLine();
        PMP = Console.ReadLine();
        PMF = string.Format("{TR:C,PMP:C}") <------- THIS IS WHERE I AM TRYING TO CONVERT AND MULTIPLY****

Any help will be grateful. Thank you

PS I am not a programmer by trade (mostly Networking Engineering and Server Admin), This is my first 20 hours into programming.