-) Delvin has an investment account in the Iron Bank of Braavos. At the start of the year, the account is worth 300, 000. After k months, the value has increased to 315, 000 and then Delvin withrew 15, 000. 2k months before the end of the year, the account is again worth 315, 000, and again, Delvin withdraws 15, 000. At the end of the year, the account is worth 315, 000 (again). The dollar-weighted yield rate turns out to be 16%. What is k?