what is the least number. which should be added to 0.0320 to make it a perfect square?	Choose one.
A) 0.0005
B) 0.0004
C) 0.0006
D) 0.0002
E) 0.0001

Rationale: 0.0320 + 0.0004 = 0.0324 ( 0.18 ) ^ 2 answer : b
Answer: B