Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 36,000 units (Dollar, Euro, Pound, etc.), from date: Jan 7, 2018, to date: Feb 7, 2028, namely for a period of 3,683 days (121 Months), with an annual simple flat interest rate of 13% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 36,000


Annual simple interest rate, R = 13%


From date: Jan 7, 2018


To date: Feb 7, 2028


Duration, T = 3,683 days (121 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(36,000 × 13% × 3,683) ÷ 365 =


(36,000 × 13 × 3,683) ÷ (365 × 100) =


1,723,644,000 ÷ 36,500 ≈


47,223.123287671233 ≈


47,223.12

B = Amount earned:

B = P + I =


36,000 + 47,223.123287671233 =


83,223.123287671233 ≈


83,223.12

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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