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Please help me understand this?

If a book costs 80.00 and the sales tax is 8.25 percent and you have 100.00 How much change will you receive back?

Now I know the answer is 13.40 But how please explain to me step by step how it was done so I can better understand this.Thank you.

Answers (2)

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100 – [ 80 + 8.25% of 80] = ∙ ∙ ∙ ∙ ∙ ∙ write the % as a decimal

100 – [ 80 + 0.0825 • 80] = ∙ ∙ ∙ ∙ ∙ ∙ ∙multiply to get amount of tax

100 – [ 80 + 6.60 ] = ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ add tax to price

100 – 86.60 = ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ subtract total from amount tendered

13.40