If a toy store's revenue in November was 4/5 of its revenue in December and its revenue in January was 1/4 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? Pick:
A) 1/4  B) 1/2  C) 2/3  D) 2  E) 4
Let 2ec rev =100   Then Nov rev is 4/5 (100) =&gt; 80   Therefore Jan rev = 1/4(Nov rev) = 1/4(80) =&gt; 20   Hence 2ec rev = x*( Nov rev+Jan rev)/2   100 = x* (80+20)/2   x = 100/50= 
<gadget id="calculator">100/50</gadget>
<output>2</output>
&gt; 2   Ans) 2
<result>D</result>
If a toy store's revenue in November was 4/5 of its revenue in December and its revenue in January was 1/4 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?