A little bit more complicated example similar to Example: Product planning which contain more explanations.
1. Text
A firm produces four products: A, B, C, and D. Each
unit of product A requires two hours of milling, one hour of assembly,
and $10 costs. Each unit of product B requires one hour of milling, three
hours of assembly, and $5 costs. Each unit of C requires 11/2 hours of
milling, 21/2 hours of assembly, and $2 costs. Finally, each unit of product
D requires five hours of milling, no assembly, and $12 costs.
The firm has 120 thousand hours of milling time and 160 thousand hours of assembly time available. In addition, not more than $1 million may be tied up in inprocess inventory.
Each unit of product A returns a profit of $40; each unit of B returns a profit of $24; each unit of product C returns a profit of $36; and each unit of product D returns a profit of $23. Not more than 20,000 units of product A can be sold; not more than 16,000 units of
product C can be sold; and any number of units of products B and D may be sold. However, at least 10,000 units of product D must be produced and sold.
The objective of the firm is to maximise the profit resulting from the sale of the four products.
Note: Even if the text looks hopeless it helps a lot to organise it into tables.
2. Tables
(hours per unit) 
(hours per unit) 
($ per unit) 





















Table 1: Production requirements
(units) 
(units) 
($ per unit) 

















Table 2: Sales characteristic