A restaurant frequently offers a special prix fixe meal and has been charging $150 $
⁢
150
per person for the event. At that price, they’ve been averaging 40
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 $1500
$
⁢
1500
and preparing each customer’s meal costs an additional $30
$
⁢
30
. What are the break-even points in terms of customers served? Write the exact answer. Do not round. Separate multiple answers with a comma.