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  1. or download this
    1 - ( 0.80 + 0.20*(1-0.40) ) = 1 - 0.92 = 0.8 = 8%
  2. or download this
    0.20 = 0.10 + 0.90 * x
    0.10 / 0.90 = x
    1/9 = x