
Kenneth S. answered 03/06/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
If it's on sale for one third OFF, then the price that you pay will be the other 2/3 of the original "List" price.
(2/3)(28.50) = $19
LESSON: one third off means 2/3 ON! (You pay two thirds of orig. price)