Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 1 - Section 1.12 - Multiplication and Division of Decimal Fractions - Exercises - Page 73: 69


688,000 tons

Work Step by Step

Multiply to find the annual weight and convert to tons. Note the cancellation of units in the numerators and denominators. $\frac{4.4\ lb}{1\ person}\times312,780,968\ person\times\frac{1\ ton}{2000\ lb}$ $=1,376,236,259.2\ lb\times\frac{1\ ton}{2000\ lb}=68\underset\uparrow8,118.126\ ton$ The number to the right of the thousands digit is less than 5 so round down.
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