Correct option is B
Formula Used:
Average salary = (Sum of all salaries) ÷ Total number of persons
Solution:
Sum of all salaries = ₹15,000 + ₹25,000 + ₹30,000 + ₹12,000 + ₹18,000 = ₹100,000
Total number of persons = 5
Average salary = ₹100,000 ÷ 5 = ₹20,000