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For the past \(n\) days, the average (arithmetic mean) daily production at a company was \(50\) units. If today's production of \(90\) units raises the average to \(55\) units per day, what is the value of \(n?\)
(A) 30
(B) 18
(C) 10
(D) 9
(E) 7
Answer: E
Source: Official Guide
(A) 30
(B) 18
(C) 10
(D) 9
(E) 7
Answer: E
Source: Official Guide
