Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Jul 16, 2023, to date: Jun 16, 2054, namely for a period of 11,293 days (371 Months), with an annual simple flat interest rate of 4.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 4.5%


From date: Jul 16, 2023


To date: Jun 16, 2054


Duration, T = 11,293 days (371 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 × 4.5% × 11,293) ÷ 365 =


(100 × 4.5 × 11,293) ÷ (365 × 100) =


5,081,850 ÷ 36,500 ≈


139.228767123288 ≈


139.23

B = Amount earned:

B = P + I =


100 + 139.228767123288 =


239.228767123288 ≈


239.23

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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