On 1st April, an existing firm had assets of Rs. 75,000 including cash of Rs. 5,000. Its creditors amounted to Rs. 5,000 on that date. The firm had a reserve of Rs. 10,000 while partner’s Capital Accounts showed a balance of Rs. 60,000. If Normal Rate of Return is 20% and goodwill of the firm is valued at Rs. 24,000 at four years’ purchase of super profit, Find average profit per year of the existing firm.