The Roomba 570 Is a Robotic Vacuum Cleaner Made and Sold

The Roomba 570 is a robotic vacuum cleaner made and sold by iRobot. It can vacuum 4 rooms on a single battery charge and it costs $2 of electricity to charge the Roomba. Lynn is a house cleaner and can vacuum 4 rooms in 1 hour with a traditional vacuum. Suppose you want the 4 rooms in your house vacuumed once a week for one year. Ignoring the cost of any electricity Lynn uses, what is the maximum Lynn could charge per hour for you to choose her over the Roomba?

A) $10.23 per hour
B) $20.45 per hour
C) $8.27 per hour
D) $16.54 per hour