According to timothy may, what was one action taken by the mongols to control the territory they conquered

According to the document you've provided, what the Mongols sometimes did was keep a governmental system in place if it was proven to be effective and also useful for their Khan. And this is reasonable, they had no reason why they wouldn't leave a governmental system in place which was very effective and was producing a lot of goods for the Mongols. 

Explanation:

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 % " .