Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Sep 6, 2017, to date: Oct 6, 2017, namely for a period of 30 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 854%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 2%


From date: Sep 6, 2017


To date: Oct 6, 2017


Duration, T = 30 days


Commission fee (withdrawal or payment), F = 854%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 2% × 30) ÷ 365 =


(4,000 × 2 × 30) ÷ (365 × 100) =


240,000 ÷ 36,500 ≈


6.575342465753 ≈


6.58

B = Amount earned before deducting the
commission fee (withdrawal or payment):

B = P + I =


4,000 + 6.575342465753 =


4,006.575342465753 ≈


4,006.58

D = Amount earned after deducting the
commission fee (withdrawal or payment):

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 854%) × 4,006.575342465753 =


- 754% × 4,006.575342465753 ≈


- 30,209.578082191778 ≈


- 30,209.58

Pr = Investment profit:

Pr = D - P =


- 30,209.578082191778 - 4,000 =


- 34,209.578082191778 ≈


- 34,209.58

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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