Write a c program to compute an electricity bill

 Write a c program to compute an electricity bill

Unit	Rate/unit
1-100	4
101-200	4.50
201-400	5
400 up	6

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

void main()
{
float amount;
int unit;
clrscr();
p:
printf("\nENter Unit= ");
scanf("%d",&unit);
if(unit>=1&&unit<=100)
{
amount=unit*4;
}
else if(unit>=100&&unit<=200)
{
amount=unit*4.50;
}
else if(unit>=201&&unit<=400)
{
amount=unit*5;
}
else if(unit>=401)
{
amount=unit*6;
}
else
{
printf("please enter correct unit");
goto p;
}
printf("\nElectrity bill: %2f",amount);
getch();
	}

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