For the past n days, the average (arithmetic mean) daily production at a company was 50 units. If today's production of 110 units raises the average to 55 units per day, what is the value of n?	Choose the most appropriate option
A) 9	B) 11	C) 13	D) 15	E) 17

Rationale: "the daily production was raised by 5 units for n days , which has a weighting of 5 n . 5 n = 110 - 55 = 55 n = 11 the answer is b ."
Answer: B