11.
In a mine site, the cost of shaft sinking in lakhs of rupees is given as 2.64D + 34.8, where D is the shaft depth in m. In the same site, the corresponding cost of driving an incline is 0.96 L, where L is the length of the incline in m. Assuming L by D ratio is 3.0, the depth in m beyond which the shaft sinking becomes more economical is

12.
An investment of Rs. 10,000, compounded annually, is estimated to return Rs. 20,000 after 6 years from the date of investment. The expected rate of return on this investment in percentage is

15.
A firm, having a cost of capital of 12%, evaluates a small mining project of initial investment of Rs. 100 lakhs. For the benefits shown in the table below, the benefit-cost ratio of the project is
Year 1 2 3 4
Benefits (Rs. in lakhs) 25 40 40 50

16.
A company producing bearing plates for rock bolts has the selling price Rs. 20/unit and the variable cost has Rs. 12/unit. If the total fixed cost is Rs. 5,60,000, then the break even output units of bearing plates is

18.
A mining company is considering the following project:
Cash Flows (Rs.) for five years
Year 0 1 2 3 4 5
Net Cash Flow In (Rs.) -50000 15000 15000 15000 15000 15000

What is the project's IRR?

19.
A mining equipment has a life of 5 years with no salvage value. Assuming that the depreciation of the equipment is calculated by the straight line method, the average annual value of the equipment percentage of its original value is