Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,259 units (Dollar, Euro, Pound, etc.), from date: Apr 25, 2018, to date: Dec 25, 2019, namely for a period of 609 days (20 Months), with an annual simple flat interest rate of 4.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,259


Annual simple interest rate, R = 4.5%


From date: Apr 25, 2018


To date: Dec 25, 2019


Duration, T = 609 days (20 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(3,259 × 4.5% × 609) ÷ 365 =


(3,259 × 4.5 × 609) ÷ (365 × 100) =


8,931,289.5 ÷ 36,500 ≈


244.692863013699 ≈


244.69

B = Amount earned:

B = P + I =


3,259 + 244.692863013699 =


3,503.692863013699 ≈


3,503.69

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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