The profit in thousands of dollars from spending x thousand dollars on advertising is given by P(x) = 1000+32x−2x2. Findthemarginalprofitatthefollowingspendinglev

The profit in thousands of dollars from spending x thousand dollars on advertising is given by P(x) = 1000+32x−2x2. Findthemarginalprofitatthefollowingspendinglevels, and decide whether or not the company should increase the amount spent in each case.

 

A) $8000

->-31968

 

B)$6000

->-2368

 

C)$12000

-> -47968

 

D)$20000

-> -79968

 

I got the answers but don't know decide whether or not the company should increase the amount spent in each case.