Answers by visitors named: Racine

The last printer adds 20 books to the total output. So, the marginal productivity of the last printer is 20 books. The marginal productivity of the last printing press is 1000 books. The optimal choice of input is determined by the condition, Marginal productivity of printer Marginal productivity of printing press Wage rate of the printer Price of the printing press 20 /20 ‚ 1000 / 5000 1 ‚ 0.2