Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100,000 units (Dollar, Euro, Pound, etc.), from date: Jan 21, 2019, to date: Feb 20, 2020, namely for a period of 395 days (13 Months without 1 Days), with an annual simple flat interest rate of 20% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100,000


Annual simple interest rate, R = 20%


From date: Jan 21, 2019


To date: Feb 20, 2020


Duration, T = 395 days (13 Months without 1 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100,000 × 20% × 395) ÷ 365 =


(100,000 × 20 × 395) ÷ (365 × 100) =


790,000,000 ÷ 36,500 ≈


21,643.835616438356 ≈


21,643.84

B = Amount earned:

B = P + I =


100,000 + 21,643.835616438356 =


121,643.835616438356 ≈


121,643.84

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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