#### Principal (initial amount), P = 4,000

#### Annual simple interest rate, R = 2%

#### From date: Apr 11, 2018

#### To date: May 11, 2018

#### Duration, T = 30 days

#### Commission fee (withdrawal or payment), F = 5%

#### No. of days in a year, N = 365

## I = Simple interest:

#### I = (P × R × T) ÷ N =

#### (4,000 × 2% × 30) ÷ 365 =

#### (4,000 × 2 × 30) ÷ (365 × 100) =

#### 240,000 ÷ 36,500 ≈

#### 6.575342465753 ≈

#### 6.58

## B = Amount earned before deducting the

commission fee (withdrawal or payment):

#### B = P + I =

#### 4,000 + 6.575342465753 =

#### 4,006.575342465753 ≈

#### 4,006.58

## D = Amount earned after deducting the

commission fee (withdrawal or payment):

#### D = B - F =

#### B - F% × B =

#### (1 - F%) × B =

#### (1 - 5%) × 4,006.575342465753 =

#### 95% × 4,006.575342465753 ≈

#### 3,806.246575342465 ≈

#### 3,806.25

## Pr = Investment profit:

#### Pr = D - P =

#### 3,806.246575342465 - 4,000 =

#### - 193.753424657535 ≈

#### - 193.75