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Write a program to calculate Electricity 2. Write a program to calculate Electricity bill in PHP? (5 marks) Description: You need to write a PHP program calculate electricity bill using if-else conditions. Conditions: For first 100 units – Rs. 3.50/unit For next 200 units – Rs. 4.00/unit For next 300 units Rs. 5.20/unit For units above 400 Rs. 6.50/unit Hint Use if else