On 1st April, 2019, 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 Partners' 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.    (3 marks)