everly corporation acquires a coal mine at a cost of $400,000. intangible development cost total $100,000. after extraction has occurred, everly must restore the property (estimated fair value of the obligation is $80,000), after which it can be sold for $160,000. everly estimates that 4,000 tons of coal can be extracted. if 700 tons are extracted the first year, prepare journal entry to record depletion.