Question

what expressions can be used to calculate the total price of a DVD that cost d dollars if the tax rate is 7.5%

Answer 1

The total price of a DVD that costs d dollars with a tax rate of 7.5% can be calculated using the following expression:

total_price = d + (d * (7.5/100))

or

total_price = d * (1 + (7.5/100))

In the first expression, we calculate the cost of the tax by multiplying the cost of the DVD (d) by the tax rate (7.5/100) and then add that amount to the cost of the DVD to get the total price.

In the second expression, we express the total price as the cost of the DVD (d) multiplied by the sum of 1 and the tax rate (7.5/100). This is equivalent to the first expression and gives us the same result