Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,947.3 units (Dollar, Euro, Pound, etc.), from date: Sep 30, 2015, to date: Jun 30, 2018, namely for a period of 1,004 days (33 Months), with an annual simple flat interest rate of 9.75% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 2,947.3


Annual simple interest rate, R = 9.75%


From date: Sep 30, 2015


To date: Jun 30, 2018


Duration, T = 1,004 days (33 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,947.3 × 9.75% × 1,004) ÷ 365 =


(2,947.3 × 9.75 × 1,004) ÷ (365 × 100) =


28,851,119.7 ÷ 36,500 ≈


790.441635616438 ≈


790.44

B = Amount earned:

B = P + I =


2,947.3 + 790.441635616438 =


3,737.741635616438 ≈


3,737.74

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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