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A production line averaged 40 units for the past d days. Today, this production line produced 100 units, increasing the average by 25%. What is the value of d?
A) 5
B) 9
C) 10
D) 20
E) 30
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The average increases to 50 based on the information. Thus, (40d+100)/d+1 = 50.
40d + 100 = 50d + 50
50 = 10d
D= 5
40d + 100 = 50d + 50
50 = 10d
D= 5
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