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: May 24, 2017, to date: May 24, 2021, namely for a period of 1,461 days (48 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 25,000


Annual simple interest rate, R = 3%


From date: May 24, 2017


To date: May 24, 2021


Duration, T = 1,461 days (48 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 × 3% × 1,461) ÷ 365 =


(25,000 × 3 × 1,461) ÷ (365 × 100) =


109,575,000 ÷ 36,500 ≈


3,002.054794520548 ≈


3,002.05

B = Amount earned:

B = P + I =


25,000 + 3,002.054794520548 =


28,002.054794520548 ≈


28,002.05

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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