Answer: 8.1%
Step-by-step explanation
The amount of tax is $49.70 - $45.99 = $3.71
Divide this over the original price to get the tax rate as a decimal.
3.71/45.99 = 0.0806697 approximately
Move the decimal point two spots to the right so we get a percentage.
We arrive at 8.06697% and then that rounds to 8.1% when rounding to the nearest tenth of a percent.