xyz company is considering investing in a project that costs rs 500000. the estimated salvage valuu is 0, tax rate is 35%. the company uses straight line method of depreciation and the proposed project with cash flows before depreciation & tax (CBDT) as follows year cbfd (rs) 1 100000 2 100000 3 150000 4 150000 5 250000 calculate the following : payback period and average rate of retur