The intent of the problem seems to be as follows:
At a certain store, the selling price of each shirt is equal to the cost price of each shirt plus a 25% markup. The total selling price of x shirts is equal to the total cost price of 25 shirts. What is the value of x?
Let the cost price of each shirt = $4.
Total selling price of x shirts = total cost price of 25 shirts = 25*4 = $100.
Selling price per shirt = cost price per shirt + 25% markup = $4 + 25% of $4 = $5.
Thus:
x = (total selling price)/(selling price per shirt) = 100/5 = 20.
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