The overall price for something that costs $21.95 with a 4.25% sales tax is $22.88. This is how to solve it:
21.95 / 100 = 0.2195 (since percentages are hundredths of a whole number, we divide the whole number by 100 to get 1% of the number)
0.2195 * 4.25 = 0.932879 (since what we got is only 1%, we need to multiply that by 4.25 to get 4.25% of 21.95)
Round 0.932879 up to the nearest thousandth (or 0.93)
And add 21.95 to 0.93.
21.95 + 0.93 = $22.88
I hope this helped you! :)