What is the difference between average number of article sold by B and D on all the four days?
Average number of article sold by B on all the four days = (102 + 85 + 140 + 117)/4 = 111 Average number of article sold by D on all the four days = (90 + 113 + 112 + 85)/4 = 100 Required difference = 111 – 100 = 11
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