#### Principal (initial amount), P = 770

#### Annual simple interest rate, R = 3.5%

#### From date: May 16, 2016

#### To date: Dec 16, 2017

#### Duration, T = 579 days (19 Months)

#### Commission fee (withdrawal or payment), F = 1%

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

## I = Simple interest:

#### I = (P × R × T) ÷ N =

#### (770 × 3.5% × 579) ÷ 365 =

#### (770 × 3.5 × 579) ÷ (365 × 100) =

#### 1,560,405 ÷ 36,500 ≈

#### 42.750821917808 ≈

#### 42.75

## B = Amount earned before deducting the

commission fee (withdrawal or payment):

#### B = P + I =

#### 770 + 42.750821917808 =

#### 812.750821917808 ≈

#### 812.75

## D = Amount earned after deducting the

commission fee (withdrawal or payment):

#### D = B - F =

#### B - F% × B =

#### (1 - F%) × B =

#### (1 - 1%) × 812.750821917808 =

#### 99% × 812.750821917808 ≈

#### 804.62331369863 ≈

#### 804.62

## Pr = Investment profit:

#### Pr = D - P =

#### 804.62331369863 - 770 =

#### 34.62331369863 ≈

#### 34.62