If the binary operation * is defind on the set Q+ of all positive rational numbers by a * b = ab/4. Then, 3∗(1/5∗1/2) is equal to

If the binary operation * is defind on the set Q+ of all positive rational numbers by a * b = ab/4. Then, 3∗(1/5∗1/2) is equal to

A

3/160

B

5/160

C

3/10

D

3/40

Answer:

The correct option is A. 3/160

Note