/***************************************************
 * Author    : CS Developers
 * Author URI: https://www.comscidev.com
 * Facebook  : https://www.facebook.com/CSDevelopers
 ***************************************************/
  
#include<stdio.h>
#define VAT 7.0
 
int main()
{
    int unit, unit_use, pay=0, service_charge;
    float bill = 0;
  
    printf("\n Enter water unit : ");
    scanf("%d", &unit);
      
    if(unit > 100){
        unit_use = unit - 100;
        pay += unit_use * 15;
        unit -= unit_use;
    }
      
    if(unit > 40 && unit <= 100){
        unit_use = unit - 40;
        pay += unit_use * 10;
        unit -= unit_use;
    }
      
    if(unit > 20 && unit <= 40){
        unit_use = unit - 20;
        pay += unit_use * 7;
        unit -= unit_use;
    }
      
    if(unit > 10){
        pay += unit * 5;
    }
     
    printf(" Enter Service charge : ");
    scanf("%d", &service_charge);
     
    bill = pay + service_charge;
    printf("\n\n Water bill before VAT is %.2f Bath", bill);
     
    bill = bill * ( 1 + (VAT / 100));
    printf("\n VAT %.2f%% is %.2f Bath", VAT, (bill * VAT) / (100+VAT));
     
    printf("\n\n Total water bill is %.2f Bath\n", bill);
  
    return 0;
}