Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 30,000 units (Dollar, Euro, Pound, etc.), from date: Apr 10, 2017, to date: May 10, 2022, namely for a period of 1,856 days (61 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 316%.

Principal (initial amount), P = 30,000


Annual simple interest rate, R = 3%


From date: Apr 10, 2017


To date: May 10, 2022


Duration, T = 1,856 days (61 Months)


Commission fee (withdrawal or payment), F = 316%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(30,000 × 3% × 1,856) ÷ 365 =


(30,000 × 3 × 1,856) ÷ (365 × 100) =


167,040,000 ÷ 36,500 ≈


4,576.438356164384 ≈


4,576.44

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

B = P + I =


30,000 + 4,576.438356164384 =


34,576.438356164384 ≈


34,576.44

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 316%) × 34,576.438356164384 =


- 216% × 34,576.438356164384 ≈


- 74,685.106849315069 ≈


- 74,685.11

Pr = Investment profit:

Pr = D - P =


- 74,685.106849315069 - 30,000 =


- 104,685.106849315069 ≈


- 104,685.11

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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