At time 0, K is deposited into Fund X, which accumulates at a force of interest delta_t = 0.0018t^2. At time m, 2K is deposited into Fund Y, which accumulates at an annual effective rate of 11%. At time n, where n > m, the accumulated value of each fund is 4K. Determine m. [1.b-f #04] 6.6 5.1 6.1 5.6 7.1