Martin Incorporated provided the following information regarding its only product: Sale price per unit Direct materials used Direct labor incurred Variable manufacturing overhead Variable selling and administrative expenses Fixed manufacturing overhead Fixed selling and administrative expenses Units produced and sold $50.00 $16,100 $186,000 $121,000 $74,000 $65,000 $12,000 $2,000 Assume no beginning inventory Assuming there is excess capacity, what would be the effect on operating income of accepting a special order for 3500 units at a sale price of $41 per product assuming additional fixed manufacturing overhead costs of $5100 is incurred? (NOTE: Assume regular sales are not affected by the special order. Round any intermediary calculations to the nearest cent.) Select one: a. Increase by $143.500 b. Decrease by $75,225 x c. Increase by $75,225 d. Increase by $80,325