Buy quantity 

10,000

10,000

Price

$3.00

$3.00

Contract Value = quantity of shares x trade price

$30,000

$30,000

Initial outlay where SingTel has a margin rate of 10%

$3,000

$30,000

Commission = 0.25% x Contract Value 

$75

$75

GST (7%)

$5.25

$5.25

Total outlay 

= Initial margin + Commission + GST

$3080.25

$30,080.25

Price

$3.50

$3.50

Profit

$$0.50 x 10,000 = 5000

$0.50 x 10,000= 5000

Closing Contract Value

$35,000

$35,000

Commission = 0.25% x Closing Contract Value

$87.50

$87.50

GST (7%)

$6.125

$6.125

Interest Charge for 5 days

3.5% x $35,000 x 5/365 = $16.781

Net Profit

= Profit – Commission – GST – Interest Charge

$4,812.344 

 $4826.125

Return on Outlay

= Net profit / Initial Outlay

160.41%

16%

Sell quantity

10,000

Price

$9.00

 Contract Value  = quantity of shares x  trade price

90,000

Initial Outlay where Keppel Corp has a margin rate of 10%

9,000

Commission
= 0.25% x Contract Value

$225

GST (7%)

$15.75

Total Outlay
  = initial margin + Commission + GST

$9240.75

Price

$8.00

Profit

$10,000

Closing contract value

$80,000

Commission

$200

GST (7%)

$14.00

Interest charge for 5 days (2.5% p.a.)

2.5% x $80,000 X 5/365 = $27.397

Net Profit = Profit – Commission – GST – Interest Charge

$9517.853

Return on Outlay= Net profit / Initial Outlay

103%