Cpp program to calculate electricity bill

Write a cpp program to calculate Electricity Bill.

Meter rent: ₹500

First 100 units :  80 paisa per unit

Next 200 units : ₹1 per unit

Above 300 units: ₹ 2.50

#include
using namespace std;
int main()
{
     float tuc,cost;
     cout<<"Calculate your elctricity bill\n";
     cout<<"Enter the number of units consumed:";
     cin>>tuc;
     if(tuc<=100)
     {
          cost=(tuc*.8)+500;
     }
     else if(tuc<=300)
     {
          cost=(100*.8)+(tuc-100)*1+500;
     }
     else
     {
          cost=(100*.8)+(200*1)+(tuc-300)*2.50+500;
     }
     cout<<"Total bill:"<     return 0;
}

Calculate your electricity bill

Enter the number of units consumed:101

Total bill:581