Write a program for electricity bill [Updated]

PROGRAM OF ELECTRICTY BILL(NOTE: IT IS APPLICABLE UNDER 200 UNITS )

#include<stdio.h>

#include<conio.h>

int main()

{

float current_unit,previous_unit,UNIT,BILL,TOTAL1,TOTAL2, GREATER_THAN_100,F_100;

float NEELAMCHARGE;

float GENERAL_SALE_TAX,ELECRICITY_DUTY,PTV_FEE;

printf("enter the current unit\n");

scanf("%f",&current_unit);

printf("enter the prevoius unit\n");

scanf("%f",&previous_unit);

//UNIT=(current_unit-previous_unit);

//printf("The unit which is consumed in 1 month %f\n",UNIT);

printf("NEELAMCHARGE\n");

scanf("%f",&NEELAMCHARGE);

printf("GENERAL_SALE_TAX\n");

scanf("%f",&GENERAL_SALE_TAX);

printf("ELECRICITY_DUTY\n");

scanf("%f",&ELECRICITY_DUTY);

printf("PTV_FEE\n");

scanf("%f",&PTV_FEE);

UNIT=(current_unit-previous_unit);

printf("The unit which is consumed in 1 month %f\n",UNIT);

if(UNIT<=100){

TOTAL1=(UNIT*5.790);

printf("the bill less than and equal to 100 unit is =%f\n",TOTAL1);

}

else{

GREATER_THAN_100=UNIT-100;

printf("the unit greater than 100 is =%f\n", GREATER_THAN_100);

TOTAL2=(GREATER_THAN_100*8.110)+(NEELAMCHARGE)+(GENERAL_SALE_TAX)+(ELECRICITY_DUTY)+(PTV_FEE);

}

F_100=5.790*100;

BILL=F_100+TOTAL2;

printf("electricity bill is %.4f\n",BILL);

getch();

}