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There are ten decades in a millennium. A decade is a period of ten years, and a millennium is a period of one thousand years. Therefore, a millennium consists of ten decades.
The payback period is ascertained by calculating the number of years needed to recover the cash invested in a project, For example, an investment of 1000 provides a return of 200,300,500 in consecutive three years. Then total of return in 3 years will be equal to the original investment. Hence the payback period is three years.
1000 years is called a millenium.
1000000/1000=1000 1000/365.25~2.73785079 years
Ten of them because 10 times 100 years = 1000 years