Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Apr 22, 854, to date: May 22, 2017, namely for a period of 424,807 days (13,957 Months), with an annual simple flat interest rate of 2,100% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 2,100%


From date: Apr 22, 854


To date: May 22, 2017


Duration, T = 424,807 days (13,957 Months)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 2,100% × 424,807) ÷ 365 =


(100 × 2,100 × 424,807) ÷ (365 × 100) =


89,209,470,000 ÷ 36,500 ≈


2,444,095.068493150685 ≈


2,444,095.07

B = Amount earned:

B = P + I =


100 + 2,444,095.068493150685 =


2,444,195.068493150685 ≈


2,444,195.07

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

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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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