Following is the income statement information from Apollo Medical Devices. ($ in thousands) 2020
Net sales $4,163,770
Cost of sales before special charges 1,382,235
Special inventory obsolescence charge 27,876
Total cost of sales 1,410,111
Gross profit 2,753,659
Selling, general and admin expense 1,570,667
Research and development expense 531,086
Merger and acquisition costs 46,914
In-process research and development charges 12,244
Litigation settlement 16,500
Operating profit 576,248
Interest expense (57,372)
Interest income 2,076
Gain on disposal of fixed assets 4,929
Impairment of marketable securities (5,222)
Other income (expense), net (2,857)
Earnings before income taxes 517,802
Income tax expense 191,587
Net earnings $326,215
Required: Identify the components that we would consider operating.

You are thinking of making your mansion more energy efficient by replacing some of the light bulbs with compact fluorescent bulbs, and insulating part or all of your exterior walls. each compact fluorescent light bulb costs $4 and saves you an average of $2 per year in energy costs, and each square foot of wall insulation costs $1 and saves you an average of $0.20 per year in energy costs.† your mansion has 150 light fittings and 3000 sq ft of uninsulated exterior wall. to impress your friends, you would like to spend as much as possible, but save no more than $750 per year in energy costs (you are proud of your large utility bills). how many compact fluorescent light bulbs and how many square feet of insulation should you purchase? how much will you save in energy costs per year? (if an answer does not exist, enter dne.)