Using multipliers, the expression is given by:
[tex]y = 0.9875x[/tex]
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The decimal multiplier for a decrease of x% is given by:
[tex]M = \frac{100 - b}{100}[/tex]
In this problem, decrease of 1.25%, thus:
[tex]M = \frac{100 - 1.25}{100} = \frac{98.75}{100} = 0.9875[/tex]
Alex's net proceeds is then of 98.75% = 0.9875 of y, removing the broker proceedings, thus, the expression is:
[tex]y = 0.9875x[/tex]
A similar problem is given at https://brainly.com/question/16411122