Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,781.52 units (Dollar, Euro, Pound, etc.), from date: Apr 5, 2020, to date: Oct 28, 2020, namely for a period of 206 days (6 Months and 23 Days), with an annual simple flat interest rate of 25% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 2,781.52


Annual simple interest rate, R = 25%


From date: Apr 5, 2020


To date: Oct 28, 2020


Duration, T = 206 days (6 Months and 23 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,781.52 × 25% × 206) ÷ 365 =


(2,781.52 × 25 × 206) ÷ (365 × 100) =


14,324,828 ÷ 36,500 ≈


392.46104109589 ≈


392.46

B = Amount earned:

B = P + I =


2,781.52 + 392.46104109589 =


3,173.98104109589 ≈


3,173.98

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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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