Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 99.3372 units (Dollar, Euro, Pound, etc.), from date: Jul 17, 2018, to date: Aug 17, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 2.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 99.3372


Annual simple interest rate, R = 2.5%


From date: Jul 17, 2018


To date: Aug 17, 2018


Duration, T = 31 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(99.3372 × 2.5% × 31) ÷ 365 =


(99.3372 × 2.5 × 31) ÷ (365 × 100) =


7,698.633 ÷ 36,500 ≈


0.210921452055 ≈


0.21

B = Amount earned:

B = P + I =


99.3372 + 0.210921452055 =


99.548121452055 ≈


99.55

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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