The rise and fall of economic activity through periods of expansion and recession is known as the a. business cycle b. percentage change c. unemployment rate d. consumer price index

(A) business cycle

Explanation:

In economic theory, the process of expansion and retraction of economic activity is theoretically explained by the concept of economic cycle. According to the theory of economic cycles, it is natural for capitalism itself that the heated economy generate euphoria and expectations that are adjusted through recessive crises. After the crisis, the economy recovers gradually, restarting the economic cycle that will materialize when a new recession occurs.

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .