It actually lasted from 618 to 907.....907 - 618 = 289....almost 300 years
Simple interest is interest only calculated by multiplying the principal amount by the interest rate and the number of periods in a loan. However compound interest is interest on interest. It is calculated by multiplying the principal amount by the annual interest rate raised to the number of compound periods.
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A form of discrimination that is upheld by the law is called legal discrimination.
De facto segregation refers to segregation that occurred by fact, as opposed to by law. Jim Crow laws refer to laws upheld slavery, and segregated and discriminated against those who would later become African Americans.