Fractions seem to scare lots of folks even though they are all around us.
Miles per gallon (mpg) is certainly well-known: Miles driven divided by gallons of fuel used. The more miles you drive on a given amount of gas, the higher your mpg. The more gas you use for a given number of miles, the lower your mpg.
Why then is another fraction such a mystery? Per capita personal income is simply total personal income (PI) divided by population (POP). The higher the personal income for a given population, the greater the per capita figure. The more people you have for a given personal income, the lower your per capita personal income.