Serie inc. reported the following results from last year’s operations: sales $ 16,800,000 variable expenses 10,640,000 contribution margin 6,160,000 fixed expenses 5,488,000 net operating income $ 672,000 average operating assets $ 7,000,000 at the beginning of this year, the company has a $2,100,000 investment opportunity with the following characteristics: sales $ 2,520,000 contribution margin ratio 50 % of sales fixed expenses $ 1,108,800 if the company pursues the investment opportunity and otherwise performs the same as last year, the combined margin for the entire company will be closest to: multiple choice 4.9% 4.3% 0.9% 3.5%