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.

Let the number of students with work experience be x and those without work experience be y.
Then, 18000x + 12000y = 16000 (x + y)
⇒ 2000x = 4000y
⇒ $$\frac{x}{y}$$ = $$\frac{2}{1}$$
∴ Percentage of students with work experience
= $$\left( {\frac{2}{3} \times 100} \right)\% $$
= 66.67%
Percentage of students without work experience
= (100 - 66.67)%
= 33.33%