A
$
B
$
C
$
D
$
Explanation
Correct answer: C.
Choice C is correct. The total cost to purchase the shirt is the $ cost of the shirt plus the sales tax. The value of the sales tax on the $ shirt is equivalent to , or $. Therefore, the total cost to purchase the shirt is $ + $, or $.
Desmos solution:
Note: The expression 20 + 5% of 20 directly computes the total cost, giving 21.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from neglecting to multiply by $ when finding the value of the sales tax.
Choice B
Choice B is incorrect and may result from dividing by , instead of by , and then neglecting to multiply by $ when finding the sales tax.
Choice D
Choice D is incorrect and may result from interpreting the sales tax of as $.