PSAT Math Multiple-Choice Question 593: Answer and Explanation
Question: 593
Calculating the total cost C, including the sales tax (and no other fees), of a good with an untaxed price of P is given by the expression C = 1.07P. How could you calculate the cost of only the sales tax on the good
- A. P
- B. 0.07P
- C. 0.13P
- D. 0.17P
Correct Answer: B
Explanation:
(B) The cost of the sales tax on the good is found by subtracting the untaxed price from the total cost:
1.07P - P = 0.07P
You can also visualize this by plugging in a sample value for the price of the good. A helpful sample value to use with percentages is 100 since it gives easily understood results. If, for example, you suppose that the price of the good is $100, the cost with the sales tax included is 1.07 × $100 = $107. So the sales tax on the good is $107 - $100 = $7. This is equivalent to 0.07 × $100 = $7.
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