A population increases from 21,000 to 26,000 over a 5-year period at a constant annual percent growth rate.
 
a) By what percent did the population increase in total?
            % (round to the nearest 0.001%)
 
b) At what constant percent rate of growth did the population increase each year?
            % (round to the nearest 0.001%)
 
c) At what continuous annual growth rate did this population grow?
            % (round to the nearest 0.001%)