A laser printer manufacturer can make models i = 1,

c, 6 at any of plants j = 1,

c, 4.

The fraction of plant j capacity required per unit of printer i has been estimated for each combination at fi,j. The laser printer market is very competitive, so the price that can be charged for any model is a decreasing nonlinear (demand)

function pi of the total number of model i printers that are sold. Assuming these demand functions are know, formulate an NLP to determine a maximum total revenue production plan.