^{Viktor Hovland purchases land with natural gas reserves for $500,000. He expects to extract 2,000 units of natural gas from the reserve. In 5 years, when the land is fully depleted, the cost to restore the land to its prior state will be $100,000 and the land has no residual value. In year 1, he extracts 600 units and sells 500 units. It costs 50 dollars per unit to extract the natural gas. What is the ending book value of natural gas mine (i.e., land) after 1 year? The effective interest rate is 8 percent.}