Stacy went to a fashionista sample sale to buy miniskirts for her sorority's event. She was allowed to buy a 2nd miniskirt at half price for each miniskirt she bought at regular price. How many miniskirts did Stacy buy at the sample sale?
(1) The listed retail price of each miniskirt that Stacy bought was $21.50.
(2) Stacy bought a total of $129 in miniskirts for her sorority.