Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 402.22 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 29, 2016, to date: Jul 30, 2017, namely for a period of 396 days (13 Months and 1 Day), with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 402.22


Annual simple interest rate, R = 1%


From date: Jun 29, 2016


To date: Jul 30, 2017


Duration, T = 396 days (13 Months and 1 Day)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(402.22 × 1% × 396) ÷ 365 =


(402.22 × 1 × 396) ÷ (365 × 100) =


159,279.12 ÷ 36,500 ≈


4.363811506849 ≈


4.36

B = Amount earned:

B = P + I =


402.22 + 4.363811506849 =


406.583811506849 ≈


406.58

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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