6.) A contractor imported a bulldozer for his job, paying P250,000 to the manufacturer Freight and insurance charges amounted to P18,000; custom's broker's fees, P8,500; taxes, permits, and other initial expenses, P25,000. If the contractor estimates life of the bulldozer to be 10 years, with a salvage value of P20,000, determine the book value at the end of six years, using the: [al straight line formula [b] sinking fund formula at 8% [c] declining balance method [d] SYD method