please answer whats possible ! thank you

old machin savings generated by straight-line dep $448,000. The cost of capital is 12% and the tax rate = 40%. Koully a. $25.600 c. $112,000 b. $77,747 d. $136,058 7. The cost of equipment is $168,000; the useful life is 6 years. Salvage value is zero and the cost of capi 10% and the tax rate = 30%. The present value of the tax savings resulting from the double-declining method of depreciation is approximately (round to the nearest whole dollar)