Find the price at which the airline should sell a ticket, math homework help

Expand Your Wings Airlines finds that if it prices

a
Los Angeles to New York one way ticket at $390, it can sell 350 seats on its airplane. The airline estimates that for each $10 price reduction per ticket, however, 25 more tickets can be sold. The cost to the airline for each ticket is $150. Find the price at which the airline should sell a ticket to maximize its profit on ticket sales for the Los Angeles to New York flight.