In 1990, there were an estimated 145.0 million passenger cars registered

in the United States. The total number of vehicles registered in the United
States for 1990 was estimated at 194.5 million. What percent of the vehicles
registered were passenger cars?

If there are 145.0 million passenger cars out of 194.5 million vehicles, the percentage of passenger cars is 145.0/194.5, or 74.55%