I am trying to work through this product mix optimization problem, and I cannot understand this part on the second page (page 100):
It says...
The first 20 units of D and E produced per week can be sold at 4 dollars each, but all made in excess of 20 can only be sold at 3 dollars each.
And then later on, I see...
Define two additional products $D_2$ and $E_2$, which sell for 3 dollars per unit. What upper limits must then be placed on the sale of the original products D and E?
And then in the table below that statement, for $D$ it shows that the Number of units of $D$ produced in excess of 20 per week as having $3 for the Profit Contribution per Unit.
It is confusing to me that it says $4$ in the first part? And $3 dollars in the second part? In my opinion, it seems like 4 is correct, and the table is wrong.
Thank you.
For the profit, you have to subtract the $1 cost to create the item.