A restaurant frequently offers a special prix fixe meal and has been charging $160 per person for the event. At that price, they've been averaging 40 customers each time. Their marketing firm has convinced them that they'll gain a customer for every dollar they lower the cost of the event, and conversely lose a customer for every dollar they raise the cost. Their fixed cost per event is $2600 and preparing each customer's meal costs an additional $50. What are the break-even points in terms of customers served? Write the exact answer. Do not round. Separate multiple answers with a comma.