The given table shows the revenue, cost and tax rate for a company for a period of 6 years. The revenue and cost are given in Rs. lakhs.

Profit = Revenue - Cost
Profit after tax for any year = Profit for that year - Tax for that year
Tm, for any year = Tax rate for that year ×× Profit for that year
Find the total sum (in Rs. lakhs) of profit after tax for 20 15 to 2020 .