Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 90,000 units (Dollar, Euro, Pound, etc.), from date: Aug 15, 2020, to date: Sep 15, 2021, namely for a period of 396 days (13 Months), with an annual simple flat interest rate of 3.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 90,000


Annual simple interest rate, R = 3.5%


From date: Aug 15, 2020


To date: Sep 15, 2021


Duration, T = 396 days (13 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(90,000 × 3.5% × 396) ÷ 365 =


(90,000 × 3.5 × 396) ÷ (365 × 100) =


124,740,000 ÷ 36,500 ≈


3,417.534246575342 ≈


3,417.53

B = Amount earned:

B = P + I =


90,000 + 3,417.534246575342 =


93,417.534246575342 ≈


93,417.53

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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