Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 258 units (Dollar, Euro, Pound, etc.), from date: Jan 1, 2017, to date: Jul 1, 2017, namely for a period of 181 days (6 Months), with an annual simple flat interest rate of 18% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 258


Annual simple interest rate, R = 18%


From date: Jan 1, 2017


To date: Jul 1, 2017


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 =


(258 × 18% × 181) ÷ 365 =


(258 × 18 × 181) ÷ (365 × 100) =


840,564 ÷ 36,500 ≈


23.029150684932 ≈


23.03

B = Amount earned:

B = P + I =


258 + 23.029150684932 =


281.029150684932 ≈


281.03

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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