Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 1 - Problem Solving and Critical Thinking - 1.3 Problem Solving - Exercise Set 1.3: 16



Work Step by Step

Pens were purchased at $\$0.95$ per dozen. They were sold at $\$2.25$ for four. To get the profit on $15$ dozen pens, we can simply: 1. Take the selling price of one pen, and multiply it by 12, to get the selling price of a dozen pens. $(2.25\div4)*12=2.25*3=6.75$ (dollars for a dozen pens) The profit per dozen pens is then: $6.75 – 0.95 = 5.80$ (dollars) Which makes the profit for 15 dozen pens: $5.80*15=87$ (dollars)
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