The “Limited Plan” offers a 15% discount for power usage between 7pm – 9am if most of your usage happens during that time. If not, then you lose your discount and you pay a 20% premium on the usage outside of that time. The cost per kilowatt hour is $0.05432. How much would you have paid in March if you used 450 KWH 7pm – 9am and 465 KWH 9am – 7pm?

Question

The “Limited Plan” offers a 15% discount for power usage between 7pm – 9am if most of your usage happens during that time. If not, then you lose your discount and you pay a 20% premium on the usage outside of that time. The cost per kilowatt hour is $0.05432. How much would you have paid in March if you used 450 KWH 7pm – 9am and 465 KWH 9am – 7pm? 
•	 $49.70
•	 $51.08 Is my answer correct?
•	 $54.75
•	 $42.25

MathMate · Answer

Since usage is greater outside the prescribed period, there will be a 20% premium for those kW-h. Can you please show us how you got $51.08?

Anonymous · Answer

I was told that was the answer and wanted to make sure. Please help with showing how to work it. Thanks,

MathMate · Answer

Question says: If not, then you lose your discount and you pay a 20% premium on the usage outside of that time. Check that you have calculated without the 15% discount.

anonymys · Answer

I took the test I don't know what the answer is but $51.08 is not it because I got it wrong