Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,500 units (Dollar, Euro, Pound, etc.), from date: Jan 21, 2018, to date: Dec 21, 2018, namely for a period of 334 days (11 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 2,500


Annual simple interest rate, R = 5%


From date: Jan 21, 2018


To date: Dec 21, 2018


Duration, T = 334 days (11 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,500 × 5% × 334) ÷ 365 =


(2,500 × 5 × 334) ÷ (365 × 100) =


4,175,000 ÷ 36,500 ≈


114.383561643836 ≈


114.38

B = Amount earned:

B = P + I =


2,500 + 114.383561643836 =


2,614.383561643836 ≈


2,614.38

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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