Which one of these would be included in GDP calculations? O a. a hamburger purchased by a hungry restaurant patron O b. nails purchased by a building contractor O c. a windshield purchased by General Motors O d. petroleum purchased by a refiner from the company that drilled it Which of these is included in gross private domestic investment? O a. highway construction by a government contractor O b. an increase in business inventories O c. purchases of common stock by investors O d. the purchase of a new TV by a household If personal consumption is $50, investment is $65, government purchases total $85, imports $90, then GDP equals