Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 8,656.95 units (Dollar, Euro, Pound, etc.), from date: Aug 12, 2010, to date: Sep 12, 2010, namely for a period of 31 days, with an annual simple flat interest rate of 8.95% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 8,656.95


Annual simple interest rate, R = 8.95%


From date: Aug 12, 2010


To date: Sep 12, 2010


Duration, T = 31 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(8,656.95 × 8.95% × 31) ÷ 365 =


(8,656.95 × 8.95 × 31) ÷ (365 × 100) =


2,401,870.7775 ÷ 36,500 ≈


65.804678835616 ≈


65.8

B = Amount earned:

B = P + I =


8,656.95 + 65.804678835616 =


8,722.754678835616 ≈


8,722.75

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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