Algebra Word Problem?
The Chans' electric bill for September was $40.70, which included tax of $1.98. If the Chans used 320 kW X h of electricity that month, find the cost per kilowatt-hour.
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The Chans' electric bill for September was $40.70, which included tax of $1.98. If the Chans used 320 kW X h of electricity that month, find the cost per kilowatt-hour.
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Verified answer
Cost with tax = $40.70
tax = $1.98
cost without tax = $40.70 - $1.98
=$38.72
used 320 kWh
so cost per kWh = $38.72 / 320 kWh
= $0.121
(40.70 - 1.98) / 320 = kWh
38.72 / 320 = kWh
.121 = kWh
12.1 cents per kWh
try this:
42.68=320k
42.68/320=k
13=k