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31 December, 07:40

The new book was only $19.50 but it was another 60% if the author signed it. What will my book cost with an author's signature. (show your work)

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  1. 31 December, 07:58
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    So if you take 10% of $19.50, you have $1.95. If you multiply $1.95 by 6, you get $11.70 which is 60% of the original cost of the book. Add $11.70 to $19.50 and you have $31.20.
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