Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100,000,000,000 units (Dollar, Euro, Pound, etc.), from date: Sep 17, 436, to date: Aug 17, 2018, namely for a period of 577,782 days (18,983 Months), with an annual simple flat interest rate of 1.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100,000,000,000


Annual simple interest rate, R = 1.5%


From date: Sep 17, 436


To date: Aug 17, 2018


Duration, T = 577,782 days (18,983 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100,000,000,000 × 1.5% × 577,782) ÷ 365 =


(100,000,000,000 × 1.5 × 577,782) ÷ (365 × 100) =


86,667,300,000,000,000 ÷ 36,500 ≈


2,374,446,575,342.465753424658 ≈


2,374,446,575,342.47

B = Amount earned:

B = P + I =


100,000,000,000 + 2,374,446,575,342.465753424658 =


2,474,446,575,342.465753424658 ≈


2,474,446,575,342.47

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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