Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,000 units (Dollar, Euro, Pound, etc.), from date: Nov 16, 2018, to date: Dec 16, 2019, namely for a period of 395 days (13 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,000


Annual simple interest rate, R = 5%


From date: Nov 16, 2018


To date: Dec 16, 2019


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 =


(3,000 × 5% × 395) ÷ 365 =


(3,000 × 5 × 395) ÷ (365 × 100) =


5,925,000 ÷ 36,500 ≈


162.328767123288 ≈


162.33

B = Amount earned:

B = P + I =


3,000 + 162.328767123288 =


3,162.328767123288 ≈


3,162.33

Signs: % percent, ÷ divide, × multiply, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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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