Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 6 - Percent - 6.4 Using Proportions to Solve Percent Problems - 6.4 Exercises: 58

Answer

5 years ago about 133.9 million tax returns were filed.

Work Step by Step

We know that 51%, or 68.3 million, tax returns were filled electronically. We can use this fact to find out the total number of tax returns filed with a proportion: $\frac{51}{100}=\frac{68.3}{x}$ We cross-multiply: $51*x=100*68.3$ $51*x=6830$ $x=6830/51$ $x=133.9$ million Thus 5 years ago about 133.9 million tax returns were filed.
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