Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,300 units (Dollar, Euro, Pound, etc.), from date: May 27, 2017, to date: Dec 27, 2018, namely for a period of 579 days (19 Months), with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 742%.

Principal (initial amount), P = 3,300


Annual simple interest rate, R = 1%


From date: May 27, 2017


To date: Dec 27, 2018


Duration, T = 579 days (19 Months)


Commission fee (withdrawal or payment), F = 742%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(3,300 × 1% × 579) ÷ 365 =


(3,300 × 1 × 579) ÷ (365 × 100) =


1,910,700 ÷ 36,500 ≈


52.347945205479 ≈


52.35

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

B = P + I =


3,300 + 52.347945205479 =


3,352.347945205479 ≈


3,352.35

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 742%) × 3,352.347945205479 =


- 642% × 3,352.347945205479 ≈


- 21,522.073808219175 ≈


- 21,522.07

Pr = Investment profit:

Pr = D - P =


- 21,522.073808219175 - 3,300 =


- 24,822.073808219175 ≈


- 24,822.07

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