Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 57,000 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 200 units, with an annual simple flat interest rate of 2%, if the commission fee (withdrawal or payment) is 0.2%.

Principal (initial amount), P = 57,000


Due interest, I = 200


Annual simple interest rate, R = 2%


Commission fee (withdrawal or payment), F = 0.2%


No. of days in a year, N = 365


T = The investment duration period, in days:

T = (N × I) ÷ (P × R) =


(365 × 200) ÷ (57,000 × 2%) =


(365 × 200) ÷ (57,000 × 2/100) =


(100 × 365 × 200) ÷ (57,000 × 2) =


7,300,000 ÷ 114,000 =


64.035087719298 ≈


64.04


T = 65 days

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

B = P + I =


57,000 + 200 =


57,200

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 0.2%) × 57,200 =


99.8% × 57,200 =


57,085.6

Pr = Investment profit:

Pr = D - P =


57,085.6 - 57,000 =


85.6

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Calculator: investment duration for earning a due simple flat rate interest

Duration in days = (Simple flat rate interest × Number of days in a year) ÷ (Principal × Annual simple flat interest rate)

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