Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 15,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 20, 2017, to date: Jun 20, 2020, namely for a period of 1,096 days (36 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 15,000


Annual simple interest rate, R = 12%


From date: Jun 20, 2017


To date: Jun 20, 2020


Duration, T = 1,096 days (36 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(15,000 × 12% × 1,096) ÷ 365 =


(15,000 × 12 × 1,096) ÷ (365 × 100) =


197,280,000 ÷ 36,500 =


5,404.931506849315 ≈


5,404.93

B = Amount earned:

B = P + I =


15,000 + 5,404.931506849315 =


20,404.931506849315 ≈


20,404.93

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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