Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,300 units (Dollar, Euro, Pound, etc.), from date: Sep 10, 2016, to date: Mar 21, 2018, namely for a period of 557 days (18 Months and 11 Days), with an annual simple flat interest rate of 0.02% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,300


Annual simple interest rate, R = 0.02%


From date: Sep 10, 2016


To date: Mar 21, 2018


Duration, T = 557 days (18 Months and 11 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(3,300 × 0.02% × 557) ÷ 365 =


(3,300 × 0.02 × 557) ÷ (365 × 100) =


36,762 ÷ 36,500 ≈


1.007178082192 ≈


1.01

B = Amount earned:

B = P + I =


3,300 + 1.007178082192 =


3,301.007178082192 ≈


3,301.01

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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