Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100,000 units (Dollar, Euro, Pound, etc.), from date: Sep 30, 2019, to date: Oct 30, 2024, namely for a period of 1,857 days (61 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100,000


Annual simple interest rate, R = 5%


From date: Sep 30, 2019


To date: Oct 30, 2024


Duration, T = 1,857 days (61 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100,000 × 5% × 1,857) ÷ 365 =


(100,000 × 5 × 1,857) ÷ (365 × 100) =


928,500,000 ÷ 36,500 ≈


25,438.356164383562 ≈


25,438.36

B = Amount earned:

B = P + I =


100,000 + 25,438.356164383562 =


125,438.356164383562 ≈


125,438.36

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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