Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Jan 18, 2018, to date: Mar 18, 2018, namely for a period of 59 days (2 Months), with an annual simple flat interest rate of 0.75% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 0.75%


From date: Jan 18, 2018


To date: Mar 18, 2018


Duration, T = 59 days (2 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 0.75% × 59) ÷ 365 =


(4,000 × 0.75 × 59) ÷ (365 × 100) =


177,000 ÷ 36,500 ≈


4.849315068493 ≈


4.85

B = Amount earned:

B = P + I =


4,000 + 4.849315068493 =


4,004.849315068493 ≈


4,004.85

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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