Rylan is testing 2 different types of nail polish on her fingernails to determine which one lasts longer. She purchases Brand A
and Brand B from the drug store. She then paints her nails with Brand A and her sister's nails with Brand B. She compares the nail polish at the end of the week and determines that Brand B lasts longer because there are fewer chips than Brand A. Why is her conclusion not valid?
In order to find the answer, we will have to add the initial costs of the items together, then we will calculate using the formula for percentages to find the tax rate.
<u>Calculate the percentage: </u>
<u>Add the sales tax:</u>
Which means the two items along with an 8.25% sales tax costs "$169.96 dollars."