# Stochastic programming/uknown numbers

Here on the page 77 in the lines 4 and 5, I would like to understand how were cretaed the \$7 and \$15 numbers. It should be the net margin for $$A$$ and for $$B$$, but I do not see what these definitions are. I understand the whole machinery of batches, unit prices and demand, but for these 2 numbers on that page 77.