Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 236 units (Dollar, Euro, Pound, etc.), from date: May 2, 2017, to date: Aug 2, 2017, namely for a period of 92 days (3 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 236


Annual simple interest rate, R = 5%


From date: May 2, 2017


To date: Aug 2, 2017


Duration, T = 92 days (3 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(236 × 5% × 92) ÷ 365 =


(236 × 5 × 92) ÷ (365 × 100) =


108,560 ÷ 36,500 ≈


2.974246575342 ≈


2.97

B = Amount earned:

B = P + I =


236 + 2.974246575342 =


238.974246575342 ≈


238.97

Signs: % percent, ÷ divide, × multiply, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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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