Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10,000,000 units (Dollar, Euro, Pound, etc.), from date: Jan 1, 2018, to date: Dec 31, 2018, namely for a period of 364 days (11 Months and 30 Days), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 10,000,000


Annual simple interest rate, R = 10%


From date: Jan 1, 2018


To date: Dec 31, 2018


Duration, T = 364 days (11 Months and 30 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10,000,000 × 10% × 364) ÷ 365 =


(10,000,000 × 10 × 364) ÷ (365 × 100) =


36,400,000,000 ÷ 36,500 ≈


997,260.27397260274 ≈


997,260.27

B = Amount earned:

B = P + I =


10,000,000 + 997,260.27397260274 =


10,997,260.27397260274 ≈


10,997,260.27

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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