102. 10776-!-item-!-187;#058&007653
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?
were 3 and 5 times是指啥意思
(A) $180,000
(B) $216,000
(C) $252,000
(D) $318,000
(E) $360,000
ans:A