Question 1 [5 +10 = 15 marks]
A) A company supplied electricity to residences for a monthly customer charge of $7.58 plus 8.275cents per kilowatt-hour (kWhr) for the first 400 kWhr supplied in the month and 6.574 cents per kWhr for all usage over 400 kWhr in the month.
i) What is the charge for using 700 kWhr in a month? ii) If C is the monthly charge for x kWhr, express C as a function ofx
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