The rail transport of 5.00 million tons of cargo per year for 20 years requires an initial investment of R$ 200.00 million (with no residual value) and an operating cost of R$ 10.00/t. Considering the straight-line depreciation of the investment over the productive period, the minimum rate of attractiveness of 18.50 % and the rate of 34% for income tax and social contribution, obtain the lowest freight that could be had (in R$/t) so that that this project was not uneconomical..