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Output line: days 1,2,3 give 40,60,50; four-day mean 55. Day 3 to 4 rise?

A20%
B30%
C50%
D40%
Answer & Solution
Correct answer: D. 40%
Day 4 output is 4 × 55 − 40 − 60 − 50 = 70, a rise of 20 ÷ 50 × 100 = 40%.
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