The profit (P) (in thousands of dollars) for a company spending an amount s (in thousands of dollars on advertising is: P = -1/10s^3 + 6s^2 + 400.

Find:

A.) The amount of money the company should spend on advertising in order to obtain a maximum profit.

B.) The maximum Profit.

I am stuck on this problem and I have to have it submitted soon. Can anyone help me????!?!?!?