#include<stdio.h>
void main()
{
        float number1,disc,bill;
        printf("Total purchace=>");
        if(scanf("%f",&number1)==1)
        {
                if(number1>1000)
                        disc=number1*0.04;
                elseif(number1>500)
                        disc=number1*0.02;
                else
                        disc=0;
        bill=number1-disc;
        printf("\nYour bill is Rs.%9.2f",bill);
        }

        else
        {
                printf("error enter correct value");
        }
}


=======================OUTPUT==========================

Total purchace=>800
Your bill is Rs.   784.00

Total purchace=>300
Your bill is Rs.   300.00

Total purchace=>1220
Your bill is Rs.  1171.20