For the past n days, the average (arithmetic mean) daily production at a company was 50 units. If today's production of 95 units raises the average to 55 units per day, what is the value of n? Select:
A) 6 B) 7 C) 8 D) 9 E) 10

Rationale: "the average daily production was raised by 5 units for n days , which has a weighting of 5 n . 5 n = 95 - 55 = 40 n = 8 the answer is c ."
Answer: C