Electricity Payment

#include<stdio.h>
#include<conio.h>
void main()
{
    int units;
    float total_bill;
    clrscr();
    printf("Enter the no. of units");
    scanf("%d",&units);
    if(units <= 100)
    total_bill = units * 4;
    else if(units <= 300)
    total_bill = units * 4.5;
    else if(units <= 500)
    total_bill = units * 4.75;
    else
    total_bill = units * 5;
    printf("\nThe Bill Amount Is =%f", total_bill);
    getch();
}