Bangladesh, Inc. decided to convert a large sum of Bangladeski Taka (local currency) into US dollars as an investment for future growth. The sum of the Taka totaled $5,000,000, and the company agreed to invest it at a rate of 8%, compounded semi-annually. How long does Bangladesh, Inc., need to leave it in the bank to more than double their original investment at the end of the final period to $10,129,044?