51 Suppose a new investment instrument (F) with an annual rate of return of 0.063 and a risk of 2 becomes available and the planner invests $100,000 (of the $3 million) in this investment instrument. Then the optimal total return decreases (a negative number) or increases (a positive number) by: Less than $600 Greater than or equal to $600 and less than -$400 Greater than or equal to -$400 and less than - $200 Greater than or equal to $200 and less than $0 Greater than or equal to $0 and less than $200 Greater than or equal to $200 and less than $400 Greater than or equal to $400 and less than $600 Greater than or equal to $600 Cannot be determined from the given information