Carbon footprint

Question

The United States has roughly 250 million passenger cars for 320 million people. That equates to approximately 78% of all Americans owning a car. The vehicle population in China reached almost 300 million in 2016, of which almost 200 million were passenger cars for 1.3 billion people. If China suddenly had the same amount (%) of passenger car ownership as America how many cars would they have?

Answer 1

Here's how I would do this problem:

1.3 billion people in China multiplied with 0.78 (ownership % in America in decimal form) = 1.01 x 10^11 passenger cars

1.3x10^11 x (0.78) = 1.01x10^11 passenger cars