Answer:
r = 8.80%
Step-by-step explanation:
To find the tax rate, first determine how much the tax was
57.50 - 52.85 = 4.65
Then take the original price times the tax rate = tax
52.85 * r = 4.65
Divide each side by 52.85
r = 4.65/52.85
r =.087984863
Change to decimal form
r = 8.7984863
Rounding to the nearest hundredth
r = 8.80%