If a certain toy store's revenue in November was 2/5 of its revenue in December and its revenue in January was 1/2 of its revenue in November, then the store's revenue in December was how many times the average (arithmetic mean) of its revenues in November and January?
Select the correct option:
A) 1/4	B) 1/2	C) 10/3	D) 2	E) 4
N = 2D/5   J = N/2 = D/5   The average of November and January is (N+J)/2 = 3D/5 / 2 = 3D/10   D is 10/3 times the average of November and January.   The answer is 10/3.
<result>C</result>
If a certain toy store's revenue in November was 2/5 of its revenue in December and its revenue in January was 1/2 of its revenue in November, then the store's revenue in December was how many times the average (arithmetic mean) of its revenues in November and January?