If an investor makes $10 revenue and it cost them $5 to earn it, when they take their cost away they are left with 50% margin.[/size] [/color][/size]They made 100% profit on their $5 investment[/color][/size]. If an investor makes $10 revenue and it cost them $9 to earn it, when they take their cost away they are left with 10% margin.[/color]