SOLUTION: A store advertises that during Labor Day sale $15 will be deducted from every purchase over $100. Furthermore, after the deduction is taken, the store offers and early-bird discoun

Question 998418: A store advertises that during Labor Day sale $15 will be deducted from every purchase over $100. Furthermore, after the deduction is taken, the store offers and early-bird discount of 20% to any person who makes the purchase before 10:00 am. If Rifah makes a purchase of x dollars where x > 100, at 8 am ,what is the cost of Rifah's purchase?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Early Bird:
He will get .20 discount for every dollar he spends (20% means 20 per one hundred). Thus, instead of paying 1 he will pay 1-.20= .80. The amount he spends is unknown, let's call it x. So he will pay:
.80x
Additionally, he gets a 15 discount for spending over 100:
.8x-15 is the cost of Rifah's purchase.
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