2. What motivated King to write this letter? a. King wrote the letter in an attempt to expose the unfair conditions under which he was accused and thus win his freedom.
b. King wrote the letter in response to clergymen who were concerned about the appropriateness of civil rights demonstrations.
c. King wrote to senators who were considering landmark civil rights legislation.
d. King wanted to rally his followers to march on the state capitol and demand civil rights legislation.

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 % " .