In her spare time, your colleague is selling novelty hats on Etsy. The hats are currently priced at $35/hat. Your colleague is not happy with her current revenue stream and asks you for advice. You estimate that the demand for her hats is: Q = 600 - 10P. If your colleague is looking to maximize revenue, how should she price the hats? Group of answer choices Keep prices at $35/hat Raise price to $50/hat Lower price to $30/hat Lower price to $20/hat Raise prices to $60/hat