13. Suppose we invest $21664 in a fund. Three months later our balance has grown to $23804 and we deposit an additional $4000. Two months later the balance is $28616 and we withdraw $14000. Two years after the initial investment the balance of the fund is $25132 (a) Find our annual yield (you may need some kind of numerical solver, for example, Wolfram Alpha). (b) Compute the dollar-weighted annual yield over the investment period. (c) Use equation (2.6.9) to calculate an approximate version of the dollar-weighted yield. 13. Suppose we invest $21664 in a fund. Three months later our balance has grown to $23804 and we deposit an additional $4000. Two months later the balance is $28616 and we withdraw $14000. Two years after the initial investment the balance of the fund is $25132 (a) Find our annual yield (you may need some kind of numerical solver, for example, Wolfram Alpha). (b) Compute the dollar-weighted annual yield over the investment period. (c) Use equation (2.6.9) to calculate an approximate version of the dollar-weighted yield