Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1 units (Dollar, Euro, Pound, etc.), from date: Jan 1, 754, to date: Jan 1, 2018, namely for a period of 461,667 days (15,168 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 10%


From date: Jan 1, 754


To date: Jan 1, 2018


Duration, T = 461,667 days (15,168 Months)


Commission fee (withdrawal or payment), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 10% × 461,667) ÷ 365 =


(1 × 10 × 461,667) ÷ (365 × 100) =


4,616,670 ÷ 36,500 =


126.484109589041 ≈


126.48

B = Amount earned:

B = P + I =


1 + 126.484109589041 =


127.484109589041 ≈


127.48

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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