TRENTON / AP The average cost for a year’s supply of a prescription drug doubled in just seven years to more than $11,000 — about three-quarters of the average annual Social Security benefit. That’s according to the latest study of price trends for widely-used drugs conducted by AARP, the senior citizens advocacy group. It finds prices for existing drugs, driven …

Canberra / Bloomberg Qantas Airways Ltd.’s credit rating has been upgraded by Moody’s Investors Service, ending the Australian carrier’s more than two-year spell as a junk-rated credit. The Sydney-based airline was raised one level to Baa3 by Moody’s, which had stripped it of investment-grade status back in January 2014. The move by Moody’s, which now has a stable outlook on …

NEW YORK / AP JC Penney Co. delivered strong fourth-quarter results, wrapping up a year when it stole market share from rivals. The company, based in Plano, Texas, offered an upbeat sales outlook, as efforts to spruce up its merchandise are winning over shoppers. It also pledged that it would return to a profit this year, on an adjusted basis. …