of staples tacked on 2% after fortune magazine reported several private equity firms, including ba cital, are considering a buyout offer for the retailer. but check out the jump in shares of rival office max, up nearly 15%. it expects a pre-tax gain in quarterly earnings, thanks to a settlement with lehman brothers over a debt offering. a rough landing for shares of spirit airlines. the stock fell over 15% after the company warned a key revenue figure would fall this year. the carrier predicts a fall of as much as 4% in revenue per available seat mile. that's how much it costs to fly a passenger a single mile. shares of doctor pepper fizzled; blame it on new data from nielsen showing a op in monthly u.s. beverage sales. dr. pepper snapple group fell almost 3%, far more than coca- cola and pepsico shares, which were basically flat. meanwhile, oil futures briefly topped $100 a barrel, the first time in four months. crude prices ended the day at $99, with a $.60 gain, pushed higher by the fed's action thursday, as well as continued unrest in the middle east and north africa. as for the most