How do i do this problem The cost of manufacturing x fishing rods is given by C(x)=800+2x+(1 10000 )x 2 Suppose the price of each rod is a function

How do i do this problem The cost of manufacturing x

 fishing rods is given by 

C(x)=800+2x+(1

10000

)x

2

Suppose the price of each rod is a function of the number manufactured and is given by 

p=10−0.0004x

If all fishing rods manufactured can be sold, what is the number x

 that yields maximum profit?