3. An electricity board charges the following rates to domestic users to discourage large consumption of energy. • For the first 100 units – 50 P per unit • Beyond 100 units - 60 P per unit If the...

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Extracted text: 3. An electricity board charges the following rates to domestic users to discourage large consumption of energy. • For the first 100 units – 50 P per unit • Beyond 100 units - 60 P per unit If the total cost is more than Rs.250.00 then an additional surcharge of 15% is added on the difference. Define a class Electricity in which the function Bill computes the cost. Define a derived class More_Electricity and override Bill to add the surcharge.