If electrical energy costs 7¢/kW•h, calculate

the cost of running a 15 W scanner for

10 min. (You will need to convert 10 min

into hours.)

10 minutes = (1/6) th of an hour

cost of running it for an hour = 0.09*7=0.56 c

in 10 min the cost should be (1/6) * 0.56c=0.08c

Explanation:

Your scanner power is 15W so, it will consume 15*60=90Wh of electricity in an hour. that is 0.09KWh.

So, cost of running it for an hour = 0.09*7=0.56 c

Which means that in 10 min the cost should be (1/6) * 0.56c=0.08c