Asolar panel measures 0.57 m by 1.3 m. in direct sunlight, the panel delivers 6.6 a at 6 v. if the intensity of sunlight is 300 w/m2, what is the efficiency, as a percentage, of the solar panel in converting solar energy into electrical energy?

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