Joannie lent $200 to her sister. four years later, her sister repaid her in full with $228. what simple annual interest rate did joannie's sister pay?i am not good with mathematics at all!

Idon't want to fail summer school.the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table.the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.