Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,963 units (Dollar, Euro, Pound, etc.), from date: Jun 6, 2017, to date: Oct 6, 2019, namely for a period of 852 days (28 Months), with an annual simple flat interest rate of 25% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,963


Annual simple interest rate, R = 25%


From date: Jun 6, 2017


To date: Oct 6, 2019


Duration, T = 852 days (28 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,963 × 25% × 852) ÷ 365 =


(1,963 × 25 × 852) ÷ (365 × 100) =


41,811,900 ÷ 36,500 =


1,145.531506849315 ≈


1,145.53

B = Amount earned:

B = P + I =


1,963 + 1,145.531506849315 =


3,108.531506849315 ≈


3,108.53

Signs: % percent, ÷ divide, × multiply, ≈ 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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