(a) Let the number of students who got the jobs of A,B and C categories be a,b and c, respectively. Then the total salary =2(a+b+c)26(a+b)+44(b+c)+34(c+a)​=2(a+b+c)60a+70b+78c​=a+b+c30(a+b+c)+(5b+9c)​=30+some positive valueSo, the minimum salary must be ₹ 30 lakh and the maximum salary can not exceed 44, which is the highest of the three.