Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 12,500 units (Dollar, Euro, Pound, etc.), from date: Apr 20, 2017, to date: Dec 20, 2018, namely for a period of 609 days (20 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 15,000%.

Principal (initial amount), P = 12,500


Annual simple interest rate, R = 10%


From date: Apr 20, 2017


To date: Dec 20, 2018


Duration, T = 609 days (20 Months)


Commission fee (withdrawal or payment), F = 15,000%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(12,500 × 10% × 609) ÷ 365 =


(12,500 × 10 × 609) ÷ (365 × 100) =


76,125,000 ÷ 36,500 ≈


2,085.616438356164 ≈


2,085.62

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

B = P + I =


12,500 + 2,085.616438356164 =


14,585.616438356164 ≈


14,585.62

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 15,000%) × 14,585.616438356164 =


- 14,900% × 14,585.616438356164 =


- 2,173,256.849315068436 ≈


- 2,173,256.85

Pr = Investment profit:

Pr = D - P =


- 2,173,256.849315068436 - 12,500 =


- 2,185,756.849315068436 ≈


- 2,185,756.85

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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