Information about Harlequin Corporation is as follows: Output (units) Selling price per unit 2018 40,000 $25.00 2019 42,000 $25.00 Input quantities: Materials (pounds) Labor (hours) 2,000 2,000 1,625 1,600 Input prices: Materials (per pound) Labor (per hour) $5.00 7.00 $5.50 7.50 By how much did profits change as a result of changes in productivity related to labor? Oa. $412.50 decrease Ob. $550.00 decrease Oc. $412.50 increase Od. $550.00 increase