Program To Accept No. Of Electrical Units Consumed And Then Display The Bill Payable

/*  PROGRAM TO ACCEPT NO. OF ELECTRICAL UNITS CONSUMED AND THEN DISPLAY
  	   THE BILL PAYABLE USING EITHER TELESCOPIC OR NON-TELESCOPIC
  	  METHOD BASED ON THE USERS CHOICE.THE RATES ARE AS GIVEN BELOW
  		UNITS                         RATE
  	      -----------                 -------------
  		   <= 100                   Rs. 1.50 PER UNIT
  	       101 -> 300                   Rs. 2.50 PER UNIT
  	       301 -> 500                   Rs. 3.50 PER UNIT
  		    > 500                   Rs. 4.50 PER UNIT            */
  
  #include<stdio.h>
  #include<conio.h>
  void main()
  {	int u;
  	float b;
  	char ch;
  	clrscr();
  	printf("\nenter number of units consumed\n\n");
  	scanf("%d",&u);
  	printf("\nCompute the bill using (n)on-telescopic or (t)elescopic  method: \n\n");
  	fflush(stdin);
  	ch=getchar();
  	if(ch=='n')
  	  { if(u<=100)
  	      b = u*1.50;
  	    else if(u<=300)
  	      b = u*2.50;
  	    else if(u<=500)
  	      b = u*3.50;
  	    else
  	      b = u*4.50;
  	    printf("\nelectricity bill payable in non-telescopic method = %f",b);
  	  }
  	else if(ch=='t')
  	  { if(u<=100)
  	      b = u*1.50;
  	    else if(u<=300)
  	      b = (100*1.50)+((u-100)*2.50);
  	    else if(u<=500)
  	      b = (100*1.50*1)+(200*2.50)+((u-300)*3.50);
  	    else
  	      b = (100*1.50)+(200*2.50)+(200*3.50)+((u-500)*4.50);
  	    printf("\nelectricity bill payable in telescopic method = %f",b);
  	  }
  	  else
  	     printf("\n invailed option\n");
         getch();
  }

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