Rob is starting a business selling handmade necklaces. He has decided to invest an initial amount of $380 for advertising, and materials cost $1 for each necklace he makes. Rob can sell his creations for $39 per necklace. Once he makes and sells a certain number of necklaces, he will break even, with identical expenses and sales. How many necklaces would that take? What would the total expenses and sales be then?