A medical laboratory analyzes blood specimens. Its operating expense would include money spent on all the following, except: test tubes technicians' salaries monthly rent for office space corporate income tax paid to the state government Monthly rent for office-space is a good example of a: Fixed cost Semi-variable cost Variable cost Stepped cost A medical practice consists of two dermatologists. The organization's operating income would include items such as: consultation fees paid by dermatology patients interest earned by money deposited in a nearby bank rent paid by a paralegal who sublets space in the dermatologists' office a profit on some art-work sold recently The financial status of a company is best understood by reviewing all of these, except: Balance Sheet Statement of Cash Flows Federal form 1040 Income Statement