The sales tax rate for the state of Washington was 7.4%
What is the final cost of the car, including tax?
To calculate the final cost of the car including tax, you would multiply the price of the car by the sales tax rate and add that amount to the original price of the car.
Let's say the price of the car is $20,000.
Tax amount = $20,000 * 7.4% = $1,480
Final cost of the car including tax = $20,000 + $1,480 = $21,480
So, the final cost of the car, including tax, would be $21,480.