If a computer costs 600 point 0 0 dollars and the sales tax rate is 7 point 5 percent, what is the total cost of the computer?

First calculate the sales tax: 7.5% of $600.00 is 0.075 × 600 = $45.00. Add the tax to the computer’s price: $600.00 + $45.00 = $645.00. The total cost is $645.00, choice C.

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