1. A restaurant owner is currently setting up a new restaurant. For the restroom, he has three options: paper towels, roller towels and hot air dryers. Dryers have an initial cost of $500 each and monthly service charges of $100. Paper towels cost 5 cents each and the number of paper towels used varies directly with the number of customers. Toweling rolls cost $5 per roll and will be changed daily. Which option should the owner go for protecting the environment considering this is going to be a posh restaurant?