# Program to calculate Electricity Bill

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 – • 100 to 200 units – • 200 to 300 units – • above 300 units – 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: • Else if, check that units consumed is less than equal to the 200, if yes then total electricity bill will be: • Else if, check that units consumed is less than equal to the 300, if yes then total electricity bill will be: • Else if, check that units consumed greater than 300, if yes then total electricity bill will be: Below is the implementation of the above approach:

## Java

 // 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));      }  }

Output:

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