Thirty six of the staff of 80 teachers at a local school, Ask an Expert

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Thirty six of the staff of 80 teachers at a local school are certified in CPR. In 180 days of school, assuming that none of the teachers were ever absent, about how many days is it that the teacher on bus duty will likely be certified in CPR?

A. 5 days

B. 45 days

C. 65 days

D. 81 days

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