By Paula Burkes Business Writer pburkes@oklahoman.comEven if premiums rise 50 percent next year on Oklahoma's individual policies for health insurance, 84 percent of Oklahomans who buy policies on the federally run healthcare.gov marketplace will be able to buy coverage for $100 or less per month, according to analysis released Wednesday by the federal government. That's due to two factors: tax credits correspondingly will increase along with premiums, and consumers can shop around to find the best plan, said spokespersons for the U.S.