Alvin is starting a business selling handmade necklaces. He has decided to invest an initial amount of $99 for advertising, and materials cost $6 for each necklace he makes. Alvin can sell his creations for $15 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?