Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jan 4, 2018, to date: Jul 4, 2018, namely for a period of 181 days (6 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 10%


From date: Jan 4, 2018


To date: Jul 4, 2018


Duration, T = 181 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 =


(1,000 × 10% × 181) ÷ 365 =


(1,000 × 10 × 181) ÷ (365 × 100) =


1,810,000 ÷ 36,500 ≈


49.58904109589 ≈


49.59

B = Amount earned:

B = P + I =


1,000 + 49.58904109589 =


1,049.58904109589 ≈


1,049.59

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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