(a) A solar collector is 12.0% efficient in gathering solar energy and converting it to heat. If the average intensity of sunlight on one day is 700 W/m2, what area should your collector have to gather energy at the rate of 130 W?
m2
(b) What is the maximum cost of the solar panel if it must pay for itself in two years of operation averaging 9.00 hours per day? Assume that it earns money at the rate of 7.00¢ per kilowatt-hour. There are 365.25 days in a year.
$