<human>:  A store owner buys clothes wholesale and adds 80% to the wholesale price to set the retail price. The retail price of a pair of pants is $3<human>: A little more.
<bot>: Define a variable ** Let X be the wholesale price.
Write an equation ** The retail price of a pair of pants is X + X*80% = $36.
Simplify ** Thus 1.8*X = $36.
Simplify ** Thus X = $36 / 1.8 = $20.
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