Hello i need help solving this problem: To repay a loan, payments of 300, 500 and 700 are made at the end of years Five, six and eight, respectively. Alternatively, one can make a lump payment of 1500 at time T. Suppose that both these repayment arrangements have the same present value with the annual effective interest rate being 4%. (a) Find the exact value of T. (b) Use the dollar weighted average to approximate T. Call it T(bar). (c) Using (a) and (b), verify that T(bar) is greater than or equal to T.