In Exercises 39 through 42, write a program to carry out the stated task. Cost of E...

In Exercises 39 through 42, write a program to carry out the stated task.

Cost of Electricity The cost of the electricity used by a device is given by the formula

where kWh is an abbreviation for “kilowatt hour.” The cost per kWh of electricity varies with locality. On March 1, 2012, the average cost of electricity for a residential customer in the United States was 11.76¢ per kWh. Write a program that allows the user to calculate the cost of operating an electrical device. Figure 3.14 calculates the cost of keeping a light bulb turned on for an entire month.