Machine–A produces 40% of the total output and Machine-B produces 60% of the total output. An average of nine units out of a thousand goods manufactured by Machine-A and one unit of 250 units produced by Machine-B prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective? Choose the correct choice:
A) 0.6  B) 0.06  C) 0.006  D) 0.0006  E) 6.0e-05
Suppose machine A produce 1000 units   total defective = 9   Machine B then produces=1500 units   total defective=6   probability=15/2500= 
<gadget id="calculator">15/2500</gadget>
<output>3/500 = around 0.006</output>
0.006   C . correct
<result>C</result>
Machine–A produces 40% of the total output and Machine-B produces 60% of the total output. An average of nine units out of a thousand goods manufactured by Machine-A and one unit of 250 units produced by Machine-B prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?