1.5 tons. To make the car faster, you replaced the steel body with carbon-fiber and reduced the weight by 300 pounds. How much does your race car weigh now?

1 ton = 2,000 pounds

1.5 tons = 3,000 pounds

After reducing the weight by 300 pounds,

the car now weighs

(3,000 pounds) - (300 pounds) = 2,700 pounds.

(that's 2,700/2,000 = 1.35 tons)