Production planning of a small quarry having 3 years of life is shown in the figure. The following information of revenue and cost data are available.

Selling price of ore = Rs. 1500/tonne

Ore mining cost = Rs. 500/tonne

Waste mining cost = Rs. 500/m³

Initial capital = Rs. 1000 million

Discount rate = 10%

By neglecting depreciation, salvage value and corporate tax, the NPV of the mining project, in million Rs., is _______ [round off to 2 decimal places]