Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 60,000 units (Dollar, Euro, Pound, etc.), from date: Oct 30, 2012, to date: Aug 12, 2013, namely for a period of 286 days (10 Months without 18 Days), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 60,000


Annual simple interest rate, R = 3%


From date: Oct 30, 2012


To date: Aug 12, 2013


Duration, T = 286 days (10 Months without 18 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(60,000 × 3% × 286) ÷ 365 =


(60,000 × 3 × 286) ÷ (365 × 100) =


51,480,000 ÷ 36,500 ≈


1,410.41095890411 ≈


1,410.41

B = Amount earned:

B = P + I =


60,000 + 1,410.41095890411 =


61,410.41095890411 ≈


61,410.41

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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