Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 70,000 units (Dollar, Euro, Pound, etc.), from date: Dec 20, 2018, to date: Jan 20, 2023, namely for a period of 1,492 days (49 Months), with an annual simple flat interest rate of 6.9% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 70,000


Annual simple interest rate, R = 6.9%


From date: Dec 20, 2018


To date: Jan 20, 2023


Duration, T = 1,492 days (49 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(70,000 × 6.9% × 1,492) ÷ 365 =


(70,000 × 6.9 × 1,492) ÷ (365 × 100) =


720,636,000 ÷ 36,500 ≈


19,743.452054794521 ≈


19,743.45

B = Amount earned:

B = P + I =


70,000 + 19,743.452054794521 =


89,743.452054794521 ≈


89,743.45

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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