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 - Page 84: 38



Work Step by Step

First, find the increase in voltage by subtracting the voltage after the surge from the one before it: $=128 - 115 \\=13$ RECALL: $\text{percent increase}=\dfrac{\text{increase in value}}{\text{original value}}$ The given problem has: original value =$115$ volts increase in value = $13$ volts Sove for the percent increase using the formula above to obtain: percent increase $= \dfrac{13}{115} \\=0.1130434783 \\=0.1130434783 \times 100\% \\\approx 11.30\%$ Thus, there was an $11.30\%$ increase in voltage during the surge.
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