Answer:
$23,531,250
Explanation:
Calculation for the book value of the mine using this formula
Book value =(Cost of purchased-Residual value )/Estimated tons* (Tons of ore-Cost of purchased)
Let plug in the formula
Book value=($30,000,000 - $7,500,000)/400,000
Book value = $56.25
Book value=$56.25*115,000 = $6,468,750;
Book value= $30,000,000 - $6,468,750
Book value= $23,531,250
Therefore the book value of the mine will be $23,531,250