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+//Example 7.12
+P=0.200;//Power rating (kW)
+t=6*30;//Duration of use; 6hours per day*30days (h)
+E=P*t;//Energy consumed (kWh)
+cost=E*0.120;//Cost per month, if cost of electricity is $0.120/kWh
+printf('Cost of running the computer for the given duration = $%0.2f per month',cost)
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest