Use the rule of total probability to find the indicated probability.Two stores sell a certain product. Store A has 31% of the sales, 3% of which are of defective items, and store B has 69% of the sales, 2% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives one of this product as a gift. What is the probability it is defective?
A. 0.012
B. 0.025
C. 0.34
D. 0.023
Answer: D
Mathematics
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