In 1950, there were 40.3 million cars registered in the united states. in 1990, there were 133.7 million cars registered in the united states. what was the percent increase of registered cars from 1950 to 1990?

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?