Kenneth S. answered 05/05/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
This problem is stated rather loosely--I think $75 is the LIST PRICE (or regular price), and there's a 30% discount.
That means that a purchaser would pay 70% of the list price: 0.70($75) = $52.50.
The word COST is the amount that the seller has to expend to make, or acquire, goods that are, in turn, to be sold, at a markup (for profit & 'overhead'), thus establishing the LIST PRICE. It will be interesting to discuss this detail with your teacher!