( TCO D ) Return on investment ( ROI ) is equal to the margin multiplied by 2 . Question : ( TCO D ) For which of the following decisions are opportunity costs relevant ? The decision to make or buy a needed part The desision to keep or drop a product line ( A ) Yes Yes ( B ) Yes No ( C ) No Yes ( D ) No No 3 . Question : ( TCO D ) Last year , the House of Orange had sales of $ 826,650 , net operating income of $ 81,000 , and operating assets of $ 84,000 at the beginning of the year and $ 90,000 at the end of the year . What was the company ' s turnover , rounded to the nearest tenth ? 1 . Question : ( TCO D ) Data for December concerning Dinnocenzo Corporation ' s two major business segments-Fibers and Feedstocks-appear below : Sales revenues , Fibers $ 870,000 Sales revenues , Feedstocks $ 820,000 Variable expenses , Fibers $ 426,000 Variable expenses , Feedstocks