Classify each cost as being either variable or fixed with respect to the number of hnits produced and sold Hamburger buns in a Wendy's restaurant$\mathrm{.}2.$ Advertising by a dental office$\mathrm{.}3.$ Apples processed and canned by Del Monte$\mathrm{.}4.$ Shipping canned apples from a Del Monte plant to customers$\mathrm{.}5.$ Insurance on a Bausch & Lomb factory producing contact lenses$\mathrm{.}6.$ Insurance on Nucor's corporate headquarters$\mathrm{.}7.$ Salary of a supervisor overseeing production of printers at Ricoh$\mathrm{.}8.$ Commissions paid to automobile salespersons$\mathrm{.}9.$ Depreciation of factory lunchroom facilities at a General Electric plant$\mathrm{.}10.$ Steering wheels installed in Tesla electric vehicles.