<PRE><B>Question 534363</B>
The cost of electricity is $.08 for each of the first 300 kWh and $.13 for each kwh over 300 kwh. Find the number of Kilowhatt-hours used by a family that receives a $51.95 electric bill.
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cost = 0.08a + 0.13b
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51.95 = 0.08*300 + 0.13b
51.95 = 24.00 + 0.13b
0.13b = 27.95
b = 215 hrs
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Total hours = 215+300 = 515
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Cheers,
Stan H.
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