There is a sales tax of $5 on an item that costs $51 before tax. A second item costs $173.40 before

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There is a sales tax of $5 on an item that costs $51 before tax. A second item costs $173.40 before tax. What is the sales tax on the second item?

Calculate the sales tax percent using the first item:
Sales Tax Decimal = 100% * Sales Tax / Pre-Tax Bill
Sales Tax Decimal = 100% * 5/51
Sales Tax Decimal = 0.098

Calculate the sales tax on the second item:
Sales Tax = Pre-Tax bill * (1 + Sales Tax)
Sales Tax = $173.40 (1 + 0.098)
Sales Taax = $173.40 * 1.098
Sales Tax = $190.39