A doctor has decided to prescribe two new drugs to 200 heart patients as follows: 50 get drug B, and 100 get both. The 200 patients were chosen so that each had an 80 percent chance of having a heart attack if given neither drug. Drug A reduces the probability of a heart attack by 35 percent drug B reduces the probability by 20 percent, and the two drugs when taken together, work independently. If a randomly selected patient in the program has a heart attack, what is the probability that the patient was both drugs?
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