Hi Tatyana,
To figure out the tax on any item, you just need to do the following.
1) Take the percentage and divide it by 100 to express it as a decimal
15% / 100 = 0.15
2) Multiply the decimal from step 1) by the cost of the item. This is your tax.
19835 x 0.15 = 2975.25
3) Add the tax calculated in step 2) to the cost of the item/car. This is your total price including tax.
19835 + 2975.25 = $22,810.25