My Math Forum Electric company cost problem and explanation?

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 September 2nd, 2015, 04:40 PM #1 Newbie   Joined: Mar 2015 From: Chicago Posts: 22 Thanks: 1 Electric company cost problem and explanation? An electric company charges its customers a base rate of $10 a month plus 6 cents per kilowatt-hour(kWh) for the first 1200 kWh and 7 cents per kWh for all usage over 1200 kWh. Express the monthly cost E as a function of the amount of electricity used. Then graph the function E 0 =< x =< 2000. I got this: 10(0.06 - x) if 0 =< x < 0.06 x { 0 if 0.06 =< x =< 0.07 10(x - 7) if x > 0.07 How do I graph it? I have no idea.  September 2nd, 2015, 05:31 PM #2 Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733 Your formulas are completely wrong. I assume E is$ charged, and x is usage. E=10+.06x, x<1200 E=82+.07x, x>1200 Thanks from Country Boy

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# An electricity company charges per quarter as follows: a fixed charge of N500 and a charge of N35 per unit current used. (a) calculate the charge of 46 units of electricity (b) if VAT of 5% is paid on the bill, calculate the amount to be paid

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