In the formula A = (2r)^3, if r is halved, then A is multiplied by ? Options:
A) 64
B) 1/8
C) 1
D) 8
E) 1/64
Say r=2 =&gt; A1 = 64   when r=1; V2 = 8   V2 = 1/8*V1.   Answer : 1/8
<result>B</result>
In the formula A = (2r)^3, if r is halved, then A is multiplied by ?