In a certain company, the average salary of the bottom 30% of all employees (in terms of the salaries drawn) is Rs. 25,000 per month; the average salary of the next 50% of all employees is Rs. 75,000 per month; and the average salary of the top 20% of all employees is Rs. 175,000 per month. Find the average salary per employee for all the employees considered together.
A) Rs. 72,000 per month
B) Rs. 80,000 per month
C) Rs. 82,000 per month
D) Rs. 90,000 per month