Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,190 units (Dollar, Euro, Pound, etc.), from date: Apr 7, 2009, to date: Feb 25, 2019, namely for a period of 3,611 days (118 Months and 18 Days), with an annual simple flat interest rate of 1% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 2,190


Annual simple interest rate, R = 1%


From date: Apr 7, 2009


To date: Feb 25, 2019


Duration, T = 3,611 days (118 Months and 18 Days)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,190 × 1% × 3,611) ÷ 365 =


(2,190 × 1 × 3,611) ÷ (365 × 100) =


7,908,090 ÷ 36,500 =


216.66

B = Amount earned:

B = P + I =


2,190 + 216.66 =


2,406.66

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