Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 25,000 units (Dollar, Euro, Pound, etc.), from date: Jan 28, 2019, to date: Feb 28, 2021, namely for a period of 762 days (25 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 25,000


Annual simple interest rate, R = 12%


From date: Jan 28, 2019


To date: Feb 28, 2021


Duration, T = 762 days (25 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(25,000 × 12% × 762) ÷ 365 =


(25,000 × 12 × 762) ÷ (365 × 100) =


228,600,000 ÷ 36,500 ≈


6,263.013698630137 ≈


6,263.01

B = Amount earned:

B = P + I =


25,000 + 6,263.013698630137 =


31,263.013698630137 ≈


31,263.01

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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