A certain refrigerator requires 170 watts of electricity when it is running. It typically runs about 20 minutes per hour. How much does it cost to run this refrigerator for one year if the cost per kWh is $0.11?
What will be an ideal response?
$54.60; It runs a third of the time in a day, so it runs 8 hours a day. 8 ´ 365 = 2,920 hours a year. The watt-hours are 170 ´ 2,920 = 496,400. For kWh, divide by 1,000.
496,400 ÷ 1,000 = 496.4 kWh. 0.11 ´ 496.4 
$54.60.
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A. - 
, 
B. - 
, 7
C. - 
, 5
D. -5, 7
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