The mean monthly salary paid to graduating MBA class of a management institute is Rs 16000. The mean monthly salary paid to students with work experience is Rs 18000. The corresponding figure for the students without any work experience is Rs 12000. Determine the percentage of students with work experience and those without any work experience in the class. (a) 66.67%, 33.33%        (b) 33.33%, 66.67% (c) 75%, 25%                 (d) 25%, 75%