Conan OBrien Logging and Lumber Company owns 3,300 acres of timberland on the north side of Mount Leno, which was purchased in 2000 at a cost of $610 per acre. In 2012, OBrien began selectively logging this timber tract. In May of 2012, Mount Leno erupted, burying the timberland of OBrien under a foot of ash. All of the timber on the OBrien tract was downed. In addition, the logging roads, built at a cost of $159,000, were destroyed, as well as the logging equipment, with a net book value of $300,800. At the time of the eruption, OBrien had logged 20% of the estimated 510,000 board feet of timber. Prior to the eruption, OBrien estimated the land to have a value of $240 per acre after the timber was harvested. OBrien includes the logging roads in the depletion base. OBrien estimates it will take 3 years to salvage the downed timber at a cost of $703,500. The timber can be sold for pulp wood at an estimated price of $3 per board foot. The value of the land is unknown, but must be considered nominal due to future uncertainties. (a) Determine the depletion cost per board foot for the timber harvested prior to the eruption of Mount Leno