electricity bill

Q An electricity board charges according to the following rates:

                        For the first 100 units -   40 paisa per unit.

                        For the next 200 units -   50 paisa per unit.

                        beyond 300 units -  60 paisa per unit.

   All users are charged meter charges also, which are Rs. 50/-

#include<stdio.h>
#include<conio.h>
void main()
{
float Rs;  int unit;
clrscr();
printf("\n enter the unit of electricity ; " );
scanf("%d",&unit );
if(unit<100)

Rs=(unit*0.40);


else if (unit<=300&&unit>100)


Rs=40+((unit-100)*0.50);

else if(unit>300)

Rs=140+((unit-300)*0.60);

Rs=Rs+50;
printf("total bill:%f",Rs);

getch();




}