Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 65,000 units (Dollar, Euro, Pound, etc.), from date: Jul 20, 2015, to date: Jul 22, 2015, namely for a period of 2 days, with an annual simple flat interest rate of 0.75% if the commission fee (withdrawal or payment) is 144%.

Principal (initial amount), P = 65,000


Annual simple interest rate, R = 0.75%


From date: Jul 20, 2015


To date: Jul 22, 2015


Duration, T = 2 days


Commission fee (withdrawal or payment), F = 144%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(65,000 × 0.75% × 2) ÷ 365 =


(65,000 × 0.75 × 2) ÷ (365 × 100) =


97,500 ÷ 36,500 ≈


2.671232876712 ≈


2.67

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

B = P + I =


65,000 + 2.671232876712 =


65,002.671232876712 ≈


65,002.67

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 144%) × 65,002.671232876712 =


- 44% × 65,002.671232876712 ≈


- 28,601.175342465753 ≈


- 28,601.18

Pr = Investment profit:

Pr = D - P =


- 28,601.175342465753 - 65,000 =


- 93,601.175342465753 ≈


- 93,601.18

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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