im having a hard time with no. 2 and 5. pls help

2. A copying machine has a useful life of 3 years and a salvage value of Php20,000 was bought for Php135,000. If the owner decides to sell it after 2 years, how much should the selling price be so that he will not lose or gain if interest rate is 5% per year? a) Php90,128 b)Php80,1832 c)Php 74,750 d)Php60,218 3. A machine costing Php480,000 has a life expectancy of 12 years with a salvage value of 10% of the first cost. What is the book value after 5 years using the textbook declining balance method? a) Php183,897 b) Php152,758 c) Php196,432 d) Php214,785 4. An equipment is bought at Php420,000 with an economic life of 6 years and a salvage value of Php50,000. The first year depreciation is Php105,714. The cost of money is 12% per year. What method of depreciation was used? a) SLM b) SFM c)SYDM d)DDBM 5. The cost of a machine is Php140,000, useful life is 8 years with a salvage value at the end of its useful life of Php10,000. Determine the 4th year depreciation using the double-declining balance method. a) Php17,312 b) Php16,182 c) Php15,634 d) Php14,766