Atoy store orders jigsaw puzzles for 3 and sells them for 4.50, what is the percent of markup? round your answer to the nearest tenth of a percent ,if necessary a) 20% b) 33.3% c) 50% d)66.7

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297