Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10,000 units (Dollar, Euro, Pound, etc.), from date: Sep 1, 962, to date: Sep 1, 2019, namely for a period of 386,061 days (12,684 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 10,000


Annual simple interest rate, R = 9%


From date: Sep 1, 962


To date: Sep 1, 2019


Duration, T = 386,061 days (12,684 Months)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10,000 × 9% × 386,061) ÷ 365 =


(10,000 × 9 × 386,061) ÷ (365 × 100) =


34,745,490,000 ÷ 36,500 ≈


951,931.232876712329 ≈


951,931.23

B = Amount earned:

B = P + I =


10,000 + 951,931.232876712329 =


961,931.232876712329 ≈


961,931.23

Signs: % percent, ÷ divide, × multiply, = equal, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

Calculate simple flat rate interest on a principal borrowed, lent

Simple flat rate interest = (Principal × Annual simple flat interest rate × Duration in days) ÷ Number of days in a year

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