Rodney's Repair Service has a lug nut tightening machine that works well 86% of the time. They got a new machine that works well

Question

Rodney's Repair Service has a lug nut tightening machine that works well 86% of the time. They got a new machine that works well 96% of the time. Each machine is used 50% of the time. Use Bayes' Theorem to find the probability. If necessary, round your calculations to the nearest thousandths, and write your answer as a percent. The new machine malfunctioned. The new machine will malfunction % of the time.

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