A household is considering installing solar panels, but they need to understand what they are paying for electricity. They use an average of 15 kilowatt hours of electricity per day, and an average...

A household is considering installing solar panels, but they need to understand what they are paying for electricity. They use an average of 15 kilowatt hours of electricity per day, and an average month is 30 days. They pay $0.22 per kilowatt hour for the first 350 kilowatt hours used in a month, and $0.19 per kilowatt hour after that (a) What is their average cost of electricity?(b)What is their marginal cost of electricity?