A phone bill is $89.75 including taxes, it was $85.50 before tax. What percent of sales tax was paid?

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  • ?
    Lv 5
    7 years ago
    Favorite Answer

    There is a formula: %/100 = is/of

    First: 89.75 - 85.50 = $4.25. That is the sales tax.

    So the question is: What percent pf $89.75 is $4.25.

    x/100 = 4.25/89.75 (is/of)

    cross multiply

    89.75x = 100 * 4.25

    89.75x = 425

    divide by 89.75

    x = 425/89.75

    x = 4.735...

    x = 4.7%

    Source(s): math teacher
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  • 7 years ago

    SubTotal + SubTotal*SalesTaxRate = Total

    Total: $89.75

    SubTotal: 85.50

    SalesTaxRate: r

    85.50 + 85.50*r = 89.75

    85.50*r = 4.25

    r = .0497

    Writing the SalesTaxRate as a percentage:

    4.97%

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  • 4 years ago

    I assaume Sam and Joe are an identical person or a minimum of get an identical deal. a million. proportion revenues tax: ((ninety.ninety 5 - 80 5)/80 5)*one hundred = 7 Joe paid 7% revenues tax. 2.As a proportion of ninety.ninety 5 ((ninety.ninety 5 - 80 5)/ninety.ninety 5)*one hundred = 6.fifty 4 Sam paid 6.fifty 4% of ninety.ninety 5 revenues tax.

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  • 7 years ago

    ($89.75-$85.50/$89.75) * 100 = 4.74%

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