Calculate the investment duration period, in days, of the initial starting amount (borrowed, deposited or lent principal), of 750 units (Dollar, Euro, Pound, etc.), in order to produce an interest of 354 units, with an annual simple flat interest rate of 2%, if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 750


Due interest, I = 354


Annual simple interest rate, R = 2%


Commission fee (withdrawal or payment), F = 0%


No. of days in a year, N = 365


T = The investment duration period, in days:

T = (N × I) ÷ (P × R) =


(365 × 354) ÷ (750 × 2%) =


(365 × 354) ÷ (750 × 2/100) =


(100 × 365 × 354) ÷ (750 × 2) =


12,921,000 ÷ 1,500 =


8,614


T = 8,614 days

B = Amount earned:

B = P + I =


750 + 354 =


1,104

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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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