2000 your salary increased by 15%. In 2001 you received a 15% pay cut. After the two changes, how does your salary compare to your original salary? Cannot be determined from the information given
It is lower
It is higher
It is unchanged

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