Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,100 units (Dollar, Euro, Pound, etc.), from date: Dec 20, 2011, to date: Jan 20, 2019, namely for a period of 2,588 days (85 Months), with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,100


Annual simple interest rate, R = 4%


From date: Dec 20, 2011


To date: Jan 20, 2019


Duration, T = 2,588 days (85 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,100 × 4% × 2,588) ÷ 365 =


(1,100 × 4 × 2,588) ÷ (365 × 100) =


11,387,200 ÷ 36,500 ≈


311.978082191781 ≈


311.98

B = Amount earned:

B = P + I =


1,100 + 311.978082191781 =


1,411.978082191781 ≈


1,411.98

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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