The population of starlings in Lower Fremont was 20,000 in 1962. In 2004 the population is 160,000. How do you calculate the percentage rate of starling population growth in Lower Fremont since 1962?
Rate of growth with this wording is based on :
Note that the time interval is critical for any further calculations so it must be declared.
Time interval is: 2004-1962 in years
So we have
Using the shortcut method divide the bottom number (denominator) into the top number (numerator) and then multiply by 100 giving: