5% of $84 = $4.20
20% of $84 = $16.80
Assuming no discounts, he needs n referrals, so that
84 - 5n < 48
Adjust that 84 according to how many discounts he achieved.
Matthew would like to join an online book club that costs $84 per year. If he signs up for an automatic renewal, he will get 5% off his membership. If he signs up in July, he can get an additional 20% off. In addition, for every 2 people he refers to the club, he can get $5 off his membership. How many people does Matthew refer if he pays less than $48 for his membership? Explain.
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