The following information is for Ela Corporation: Product X: Revenue Variable Cost Product Y: Revenue Variable Cost Total fixed costs are $165 $130 $145 $120 $15,000 What is the operating income, assuming actual total sales are 900 units, and the sales mix is 2/3 of Product X and 1/3 of Product Y? $16,200 $13,500 $28,500 O $10,500 none of the above