can someone help with these 3

4 A machine that was purchased for 6,000 has an estimated useful life of 4 years and a trade-in value of 1,200. Assuming we use the sum of digits method, during which year of the useful life are the depreciation charges minimal? (a) Year 1 (b) Year 2 (c) Year 3 (d) Year 4 at t = 10 5|| A contractor pays 10,000 at t = 0 to purchase the land and 35,000 ho to purchase the materials to build a house. The house is then sold for 120,000 at t = The contractor also pays 60,000 salary for the workers. If the the interest rate is 8% effective, find the net future value (at the time of the sale) of the whole project if the salary is paid continuously from t=0 until the sale. = (a) 16448.56 (b) 17950.92 (c) 5518.78 (d) 6194.11 6A loan of 3,500 is being repaid by payments of 200 at the end of each quarter for as long as necessary, plus a final smaller payment. The nominal rate of interest convertible quarterly is 8%. What is the amount of the final payment? Please enter the amount in rounded to the nearest integer