<Dd> M R P L = 3600 − 80 L (\ displaystyle MRP_ (L) = 3600 - 80L) </Dd> <Dd> M R P L = M C L (\ displaystyle MRP_ (L) = MC_ (L)) (Profit Max Rule) </Dd> <Dd> 3600 − 80 L = 30 (\ displaystyle 3600 - 80L = 30) </Dd> <Dd> 3570 = 80 L (\ displaystyle 3570 = 80L) </Dd>

The value of the marginal product of labor equals the marginal product of labor times the