At a rate of return of 10 %, for example, NT $ 10,000 turns into $ 20,000 after seven-and-a-half years, $ 30,000 after another five years, and NT $ 40,000 after only three more years.
以百分之十的複利計算，一萬元變二萬元要花七年半，二萬變三萬不到五年，再從三萬變四萬呢，只要三年即可。