Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 150,000 units (Dollar, Euro, Pound, etc.), from date: Jan 26, 2017, to date: Apr 26, 2017, namely for a period of 90 days (3 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 150,000


Annual simple interest rate, R = 9%


From date: Jan 26, 2017


To date: Apr 26, 2017


Duration, T = 90 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 =


(150,000 × 9% × 90) ÷ 365 =


(150,000 × 9 × 90) ÷ (365 × 100) =


121,500,000 ÷ 36,500 ≈


3,328.767123287671 ≈


3,328.77

B = Amount earned:

B = P + I =


150,000 + 3,328.767123287671 =


153,328.767123287671 ≈


153,328.77

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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