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20. What is the total cost of a $20 item after adding 5% sales tax?
A. $20.05
B. $21.00
C. $22.50
D. $25.00
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1 Answer

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Choice B

Work Shown:

1.05*20 = 21

The 1.05 represents an increase of 5% because

100% + 5% = 1.00 + 0.05 = 1.05
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