Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 20,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 25, 2017, to date: Mar 25, 2022, namely for a period of 1,826 days (60 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 20,000


Annual simple interest rate, R = 12%


From date: Mar 25, 2017


To date: Mar 25, 2022


Duration, T = 1,826 days (60 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(20,000 × 12% × 1,826) ÷ 365 =


(20,000 × 12 × 1,826) ÷ (365 × 100) =


438,240,000 ÷ 36,500 ≈


12,006.575342465753 ≈


12,006.58

B = Amount earned:

B = P + I =


20,000 + 12,006.575342465753 =


32,006.575342465753 ≈


32,006.58

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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