Taxes on car purchase

If you won a sweepstakes they value the prize at $300,000 just travel and a car how would you write this on doing taxes how much would you have to pay in taxes for the gift winning?

If you won a $90,000 car how much in sales taxes would you have to pay the dealership?

When you file taxes how does the car as your property cost you will you have to pay a lot of taxes?

Income yearly is about $30,000