What is the most expensive car that he can afford to buy?
2-door coupe
4-door hatchback
compact sedan
compact SUV

The most expensive car he can afford to buy is a 4-door hatchback.

Explanation:

He has $24,000 to spend.

But sales tax is 6%.

6% of $24,000 = $1,440.

He is left with a balance of $22,560.

This means in actuality, he has $22,560 for a car.

From the table, the 4-door hatchback cost $22,500 which just slightly below the $22,560 he has to spend removing sales tax. This is the most expensive car he can afford to buy as all other cars are way above $22,560.