Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 15,000 units (Dollar, Euro, Pound, etc.), from date: Jun 21, 2017, to date: Jul 21, 2018, namely for a period of 395 days (13 Months), with an annual simple flat interest rate of 1.85% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 15,000


Annual simple interest rate, R = 1.85%


From date: Jun 21, 2017


To date: Jul 21, 2018


Duration, T = 395 days (13 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(15,000 × 1.85% × 395) ÷ 365 =


(15,000 × 1.85 × 395) ÷ (365 × 100) =


10,961,250 ÷ 36,500 ≈


300.308219178082 ≈


300.31

B = Amount earned:

B = P + I =


15,000 + 300.308219178082 =


15,300.308219178082 ≈


15,300.31

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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