Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 109,402.55 units (Dollar, Euro, Pound, etc.), from date: Nov 25, 2016, to date: May 5, 2017, namely for a period of 161 days (6 Months without 20 Days), with an annual simple flat interest rate of 10.25% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 109,402.55


Annual simple interest rate, R = 10.25%


From date: Nov 25, 2016


To date: May 5, 2017


Duration, T = 161 days (6 Months without 20 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(109,402.55 × 10.25% × 161) ÷ 365 =


(109,402.55 × 10.25 × 161) ÷ (365 × 100) =


180,541,558.1375 ÷ 36,500 ≈


4,946.344058561644 ≈


4,946.34

B = Amount earned:

B = P + I =


109,402.55 + 4,946.344058561644 =


114,348.894058561644 ≈


114,348.89

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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