<Dd> L = 44.625 (\ displaystyle L = 44.625) </Dd> <Dd> 44.625 is the profit maximizing number of workers . </Dd> <Dd> Q = 90 L − L 2 (\ displaystyle Q = 90L - L ^ (2)) </Dd> <Dd> Q = 90 (44.625) − (44.625) 2 (\ displaystyle Q = 90 (44.625) - (44.625) ^ (2)) </Dd>

At what level of variable input does marginal product begin to decrease