You purchased an asset for $45M, 13 years ago. It is currently costing $16M per year to keep it running (assume that will continue to apply in future also). The salvage value of the old asset is $6M. An equivalent new asset would cost $82M initially plus $5M per year for all maintenance and running costs. For simplicity, use an infinite study period and assume the annual maintenance and running costs of the old machine and the new machine remain constant forever. For what value of the rate of return, r, would the two options be equally attractive