Principal (initial amount), P = 100
Annual simple interest rate, R = 3%
From date: May 7, 2017
To date: May 7, 2018
Duration, T = 365 days (12 Months)
Commission fee (withdrawal), F = 768%
No. of days in a year, N = 365
I = Simple interest:
I = (P × R × T) ÷ N =
(100 × 3% × 365) ÷ 365 =
(100 × 3 × 365) ÷ (365 × 100) =
109,500 ÷ 36,500 =
3
B = Amount earned before deducting the
commission fee (withdrawal):
B = P + I =
100 + 3 =
103
D = Amount earned after deducting the
commission fee (withdrawal):
D = B - F =
B - F% × B =
(1 - F%) × B =
(1 - 768%) × 103 =
- 668% × 103 =
- 688.04
Pr = Investment profit:
Pr = D - P =
- 688.04 - 100 =
- 788.04