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5. (4 Points) Payments of $100, $200, and $500 are due at ends of years 2, 3, and 8 respectively. Assuming an effective rate of interest of 5% per annum, find the point in time at which a payment of $800 would be equivalent. (a) By Method of Equated Time (b) Exact Method (a) 5; 4.432 (b) 5; 5.832 (c) 6; 5.832 (d) 6; 6.427 (e) 7; 7.815