Question: Can someone explain this answer? I don't understand where the 0.9891 came from. When I added 0.0009 + 0.08991 my answer was 0.09081. Can someone

Can someone explain this answer? I don't understand where the 0.9891 came from. When I added 0.0009 + 0.08991 my answer was 0.09081. Can someone explain this, please.

[0.001*.90] / [(0.001*0.90) + (0.999*0.09)] 0.0009 / (0.0009) + (0.08991)

0.0009 / 0.9891

= 0.009

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