Subject: mathqa
Question: in the manufacture of a certain product , 9 percent of the units produced are defective and 5 percent of the defective units are shipped for sale . what percent of the units produced are defective units that are shipped for sale ?
Option: 
A: 0.8 %
B: 0.45 %
C: 1.25 %
D: 0.15 %
Answer: B