Elementary Technical Mathematics

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

Chapter 1 - Section 1.14 - Rate, Base, and Part - Exercises: 35

Answer

Mary needs to give $0.3$ grains.

Work Step by Step

RECALL: $P=BR$ where $B$=base, $P$=part, and $R$= rate or percent The given problem has: $B=0.75$ grains $R=40\%$ Solve for $P$ using the formula above to obtain: $P=BR \\P=40\% \times 0.75 \\P=0.40 \times 0.75 \\P=0.3 \text{ grains}$ Thus, Mary needs to give $0.3$ grains.
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