In cell B$15,$ enter a formula using the DB function to calculate the declining balance depreciation for the new shuttle service during its first year of operation. Use Year $1($cell B$14)$ as the current period. Use absolute references only for the cost, salvage, and life arguments. Fill the range C$15$:F$15$ with the formula in cell B$15$ to calculate the annual and cumulative declining balance depreciation in Years $2-5.$

Please help, the formula i have imput does not seem to be working.