A certain store found that last year the average (arithmetic mean) monthly sales from January through October was

Source: GMAT Prep

A certain store found that last year the average (arithmetic mean) monthly sales from January through October was $120,000. In November and December, the monthly sales were 3 and 5 times, respectively, the average for the other 10 months. What was the store's average monthly sales last year?

A. $180,000
B. $216,000
C. $252,000
D. $318,000
E. $360,000

The OA is A

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