Normal Profit Questions

The books of a business showed that the firm's capital employed on December 31, 2015, is $\text{Rs. }5,00,000$. The profits for the last five years were:2011: $\text{Rs. }40,000$ 2012: $\text{Rs. }50,000$ 2013: $\text{Rs. }55,000$ 2014: $\text{Rs. }70,000$ 2015: $\text{Rs. }85,000$ Find out the normal profits of the business, given that the normal rate of return is $10\%$.