Yesterday, Integrated Learning posted a 700 level GMAT question on our blog. Today, they have followed up with the answer:
Since each employee typically produces 60 units per day, in a month of 20 days the total units produced would have been 48,000. In February, though, 5 employees were sick for four days each, so they combined did not produce 1200 units while they were sick (4 x 5 x 60).
Because of that, Company X produced only 46,800 units in February. Divide by 40 employees and 20 days, and we arrive at an average of 58.5 units per employee per day.
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