Clover Corporation has the following information available for their current level 4,000 units sold a month: Total Sales Revenue Total Variable Expenses Total Contribution Margin $491,000 215,000 $276,000 The company is considering changing vendors where they can obtain the direct materials for $5 cheaper per unit. The company is also considering increase to monthly advertising by $12,500 in order to increase sales by 530 units per month. What effect would this change have on operating income? . O A. Decrease operating income by $35,150 O B. Increase operating income by $47,250 O C. Decrease operating income by $12,500 OD. Increase operating income by $46,720