/* Program to calculate the electric - bills */
/* Problem 6 */

#include <stdio.h>
#include <conio.h>

main()
{
int unit_consumed,temp;
float rate;
float bill_amount;
clrscr();
printf("Please enter the units consumed by customer : ");
scanf("%d",&unit_consumed);
if ((unit_consumed >= 0) && (unit_consumed <=  200))
	bill_amount = unit_consumed * 0.50;
else
	if (unit_consumed <= 400)
	{
		bill_amount = 100;
		temp = unit_consumed - 200;
		bill_amount +=  temp * 0.65;
	}
	else
		if (unit_consumed <= 600)
		{
			bill_amount = 270;
			temp = unit_consumed - 400;
			bill_amount += temp * 0.80;
		}
		else
		{
			bill_amount = 390;
			temp = unit_consumed - 600;
			bill_amount += temp * 1.0;
		}
printf("\nThe amount to be paid, by the customer is Rs. %.2f",bill_amount);
printf("\n\nPress any key to exit...");
getch();
}