2litre of water at is poured into a plastic bucket containing 10 litre of water at 20 degree celsius. what is the final temperature of water? (density of water=1kg/litre)

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