From the following data, calculate the (a) conventional and (b) modified benefit/cost ratios using an interest rate of 6% per year and an infinite project period. Planes is $100,000 each and the plane stays in ser- vice for 15 years. If the technology saves an average of 30 lives per year, with the value of a human life placed at $4,000,000, what is the B/C ratio? Use an interest rate of 10% per year