Suppose that a shoe company store marks up its shoes  80  %  when it buys them from the supplier.  Letting  x  represent the cost of athletic shoes purchased from the supplier.  Write an algebraic expression representing the sale price of the shoes in terms of x for yourself.  Then, after 4 months, the store manager of the shoe store discounts the shoes by  40%  , so write a simplified algebraic expression representing the sale price of a shoe in terms of x, so SP(x).

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