Edgar is starting a business selling handmade necklaces. He has decided to invest an ihitial amount of $492 for advertising, and materials cost $8 for each necklace he makes. Edgar can sell his creations for $9 per necklace. Once he makes and sells a certain number of necklaces, he will break even, with identical expenses and sales. What would the total expenses and sales be then? How many necklaces would that take?