Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 20,000 units (Dollar, Euro, Pound, etc.), from date: Mar 15, 2018, to date: Sep 15, 2018, namely for a period of 184 days (6 Months), with an annual simple flat interest rate of 1.25% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 20,000


Annual simple interest rate, R = 1.25%


From date: Mar 15, 2018


To date: Sep 15, 2018


Duration, T = 184 days (6 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(20,000 × 1.25% × 184) ÷ 365 =


(20,000 × 1.25 × 184) ÷ (365 × 100) =


4,600,000 ÷ 36,500 ≈


126.027397260274 ≈


126.03

B = Amount earned:

B = P + I =


20,000 + 126.027397260274 =


20,126.027397260274 ≈


20,126.03

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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