100% C prog for electricity bill generation

/* program to generate electricity bill for LT household purpose.

let the tariff be  as follows

Units          Rs/ unit

1-50           1.25

51-100       2.00

101-200     3.50

>200          5.50    */

#include<stdio.h>

void main()

{

   int n;

   float bill_amt;

   printf("\n enter the number of units consumed:");

   scanf("%d",&n);

   if(n>0 && n<=50)

    bill_amt=n*1.25;

   else if(n>50 && n<=100)

     bill_amt=50*1.25+(n-50)*2.00;

   else if(n>100 && n<=200)

     bill_amt=50*1.25+50*2.00+(n-100)*3.50;

   else

     bill_amt=50*1.25+50*2.00+ 100*3.50+(n-200)*5.50;

 printf("bill amount = %f", bill_amt)

}

ఔట్పుట్ తెర మీద ఇలా ... 

enter the number of units consumed:55
bill amount = 72.500000

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