Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 30,000 units (Dollar, Euro, Pound, etc.), from date: Mar 17, 2018, to date: Apr 17, 2020, namely for a period of 762 days (25 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 30,000


Annual simple interest rate, R = 10%


From date: Mar 17, 2018


To date: Apr 17, 2020


Duration, T = 762 days (25 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(30,000 × 10% × 762) ÷ 365 =


(30,000 × 10 × 762) ÷ (365 × 100) =


228,600,000 ÷ 36,500 ≈


6,263.013698630137 ≈


6,263.01

B = Amount earned:

B = P + I =


30,000 + 6,263.013698630137 =


36,263.013698630137 ≈


36,263.01

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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