The number of students (both male and female) who are learning freestyle in schools C and D together is what percent less than the number of students (both male and female) who are learning the same in schools A and B together ?

Number of students learning free style in school A = 25 % of 200 = 50
Number of students learning free style in school B = 28 % of 400 = 112
Number of students learning free style in school C = 30 % of 150 = 45
Number of students learning free style in school D = 24 % of 300 = 72
Number of students learning free style in school A and B = 50 + 112 = 162
Number of students learning free style in school C and D = 45 + 72 = 117
(162-117) / 162 =27.77 % = 27 7/9%
Option D is the correct answer