Respuesta :

The sales tax rate was C.) 7%

$22*.07(move the decimal two spaces left)
=1.54

$22+$1.54= $23.54

Answer:  The answer is (C) 7%.

Step-by-step explanation:  Given that Santino bought a book for $23.54 and the original price of the book was $22. We are to find the sales-tax rate of the book.

The sales tax on the book will be

[tex]S=\$23.54-\$22=\$1.54.[/tex]

Therefore, the sales tax rate will be

[tex]r=\dfrac{1.54}{22}\times 100\%=\dfrac{154}{22}\%=7\%.[/tex]

Thus, the correct option is (C).

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