Brilliant Corp. bought a building and land together for a total cost of $$48$ million on April $7,20$X$2.$ Building costs twice as much as the land. Brilliant estimated an economic life of building to be $40$ years with a salvage value of $$2$ million. Brilliant uses the straight$-$line depreciation method and has a calendar year end. Determine its building depreciation expense in $20$X$2.$