Theresa M. answered 01/17/19
Tutor
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Pharmacology, Dosing Calculations, PTCB--- PharmD, ADHD-friendly Tutor
Sale price = original price - discount
X= the original price
25% of the original price is represented as 25% times X, or, 0.25X
30 = X - 0.25X
30 = 0.75X
40 = X