You can adjust how the number appears using stream manipulators. I see you already have #include<iomanip> so you are set.
If you want the number to appear as 1696515.00 (appropriate for a dollar amount) then substitute this for line 89 of your above code:
cout << "This is the Total Revenue: " << fixed << setprecision(2) << totalRev_Calculation << endl;
Check out this sites reference section to learn more about the iomanip library.