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Program to calculate Electricity Bill
  • Difficulty Level : Basic
  • Last Updated : 29 Jun, 2020

Given an integer U denoting the amount of KWh units of electricity consumed, the task is to calculate the electricity bill with the help of the below charges:

  • 1 to 100 units – Rs. 10/unit
  • 100 to 200 units – Rs. 15/unit
  • 200 to 300 units – Rs. 20/unit
  • above 300 units – Rs. 25/unit

Examples:

Input: U = 250
Output: 3500
Explanation:
Charge for the first 100 units – 10*100 = 1000
Charge for the 100 to 200 units – 15*100 = 1500
Charge for the 200 to 250 units – 20*50 = 1000
Total Electricity Bill = 1000 + 1500 + 1000 = 3500

Input: U = 95
Output: 950
Explanation:
Charge for the first 100 units – 10*95 = 950
Total Electricity Bill = 950

Approach: The idea is to identify the charge bar in which it falls and then calculate the bill according to the charges mentioned above. Below is the illustration of the steps:



  • Check units consumed is less than equal to the 100, If yes then the total electricity bill will be:

    \text{Total Electricity Bill} = (\text{units} * 10)

  • Else if, check that units consumed is less than equal to the 200, if yes then total electricity bill will be:

    \text{Total Electricity Bill} = (100*10) + (\text{units}-100) * 15

  • Else if, check that units consumed is less than equal to the 300, if yes then total electricity bill will be:

    \text{Total Electricity Bill} = (100*10) + (100*15) + (\text{units}-200) * 20

  • Else if, check that units consumed greater than 300, if yes then total electricity bill will be:

    \text{Total Electricity Bill} = (100*10) + (100*15) + (100*20) + (\text{units}-300) * 25

Below is the implementation of the above approach:

C++

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// C++ implementation to calculate the 
// electricity bill 
#include<bits/stdc++.h>
using namespace std;
  
// Function to calculate the 
// electricity bill 
int calculateBill(int units) 
  
    // Condition to find the charges 
    // bar in which the units consumed 
    // is fall 
    if (units <= 100) 
    
        return units * 10; 
    
    else if (units <= 200)
    
        return (100 * 10) + 
               (units - 100) * 15; 
    
    else if (units <= 300)
    
        return (100 * 10) + 
               (100 * 15) + 
               (units - 200) * 20; 
    
    else if (units > 300)
    
        return (100 * 10) + 
               (100 * 15) + 
               (100 * 20) + 
               (units - 300) * 25; 
    
    return 0; 
  
// Driver Code 
int main() 
    int units = 250; 
    cout << calculateBill(units); 
  
// This code is contributed by spp____

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Java

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// Java implementation to calculate the
// electricity bill
  
import java.util.*;
  
class ComputeElectricityBill {
  
    // Function to calculate the
    // electricity bill
    public static int calculateBill(int units)
    {
  
        // Condition to find the charges
        // bar in which the units consumed
        // is fall
        if (units <= 100) {
            return units * 10;
        }
        else if (units <= 200) {
            return (100 * 10)
                + (units - 100)
                      * 15;
        }
        else if (units <= 300) {
            return (100 * 10)
                + (100 * 15)
                + (units - 200)
                      * 20;
        }
        else if (units > 300) {
            return (100 * 10)
                + (100 * 15)
                + (100 * 20)
                + (units - 300)
                      * 25;
        }
        return 0;
    }
  
    // Driver Code
    public static void main(String args[])
    {
        int units = 250;
  
        System.out.println(
            calculateBill(units));
    }
}

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Python3

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# Python3 implementation to calculate the 
# electricity bill 
  
# Function to calculate the 
# electricity bill 
def calculateBill(units):
  
    # Condition to find the charges 
    # bar in which the units consumed 
    # is fall 
    if (units <= 100):
       
        return units * 10
      
    elif (units <= 200):
      
        return ((100 * 10) + 
                (units - 100) * 15); 
      
    elif (units <= 300):
       
        return ((100 * 10) + 
                (100 * 15) + 
                (units - 200) * 20); 
      
    elif (units > 300):
      
        return ((100 * 10) + 
                (100 * 15) + 
                (100 * 20) + 
                (units - 300) * 25); 
      
    return 0
  
# Driver Code 
units = 250
print(calculateBill(units)); 
  
# This code is contributed by Code_Mech

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C#

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// C# implementation to calculate the 
// electricity bill 
using System;
  
class ComputeElectricityBill{ 
  
// Function to calculate the 
// electricity bill 
public static int calculateBill(int units) 
  
    // Condition to find the charges 
    // bar in which the units consumed 
    // is fall 
    if (units <= 100)
    
        return units * 10; 
    
    else if (units <= 200)
    
        return (100 * 10) + 
               (units - 100) * 15; 
    
    else if (units <= 300) 
    
        return (100 * 10) +
               (100 * 15) + 
               (units - 200) * 20; 
    
    else if (units > 300) 
    
        return (100 * 10) + 
               (100 * 15) + 
               (100 * 20) + 
               (units - 300) * 25; 
    
    return 0; 
  
// Driver Code 
public static void Main(String []args) 
    int units = 250; 
      
    Console.WriteLine(calculateBill(units)); 
  
// This code is contributed by spp____

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Output:

3500

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