Answer
The collection is 30% dimes.
Work Step by Step
Add up all the number of coins given. Dived 7 by this number and multiply by 100.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 1 - Section 1.4 - Key Math Skills for Chemistry - Questions and Problems - Page 17: 1.19c
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