When a charge of 1 c has an electric pe of 1 j, it has an electric potential of 1 v. when a charge of 2 c has an electric pe of 2 j, it's potential is?

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill