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 13, 470, to date: May 13, 2018, namely for a period of 565,425 days (18,577 Months), with an annual simple flat interest rate of 20% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 20%


From date: Apr 13, 470


To date: May 13, 2018


Duration, T = 565,425 days (18,577 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 20% × 565,425) ÷ 365 =


(100 × 20 × 565,425) ÷ (365 × 100) =


1,130,850,000 ÷ 36,500 ≈


30,982.191780821918 ≈


30,982.19

B = Amount earned:

B = P + I =


100 + 30,982.191780821918 =


31,082.191780821918 ≈


31,082.19

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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