need help on this.thank you

A one-product company finds that its profit, P, in millions of dollars, is given by the following equation where a is the amount spent on advertising, in millions of dollars, and p is the price charged per item of the product, in dollars. P(a,p) = 2ap + 150p - 20p2 - 10asp - 100 Find the maximum value of P and the values of a and p at which it is attained. The maximum value of P is attained when a is $ million and p is $ 4 The maximum value of P is $ million