Question 1152971
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Let x be the amount invested.


Then the expected positive return is 0.6*0.5x.

     The expected lose is            0.4*0.3x.


The net expected return is           0.6*0.5x - 0.4*0.3x = (0.6*0.5-0.4*0.3)x = 0.18x.


The expected net return rate is  {{{(0.18x)/x}}} = 0.18.      <U>ANSWER</U>
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Solved, answered, explained and completed.