(photographybynatalia)For three decades, Costco has been selling pallets of toilet paper, jugs of ketchup, sacks of flower, and steaks in family packs big enough to feed a reality show family. But what do you actually know about what goes on behind the scenes at the members’ only warehouse chain? Now is your chance to ask the company’s CEO Craig Jelinek. The Costco chief has volunteered to be the second subject in Consumer Reports’ new “Ask the CEO” column, which will debut next month with answers to the reader-submitted questions for General Motors CEO Mary Barra we asked for earlier this summer. Maybe you want to ask Mr.