Which one of the following is not correct?

Correct option is D

Option A: 2009 milliliters = 2 liters 9 milliliters
1 liter = 1000 milliliters
=> 2 liters = 2000 milliliters
=> 2 liters 9 milliliters = 2009 milliliters 
This statement is correct.
Option B: 25 percent = 25/100
Percent literally means “per hundred”
=> 25 percent = 25/100 
This statement is also correct.
Option C: 0.57 is equal to 0.5700
Extra zeros after the decimal point do not change the value
=> 0.57 = 0.5700 
This is also correct.
Option D: The area of a square with 30 cm side is equal to the area of a rectangle with dimensions 4.5 m × 0.2 m
Area of square = side² = 30 cm × 30 cm = 900 sq. cm
Now, area of rectangle:
4.5 m × 0.2 m = 0.9 sq. m
=> 1 sq. m = 10,000 sq. cm
=> 0.9 sq. m = 9000 sq. cm
Now compare:
Square's area = 900 sq. cm
Rectangle's area = 9000 sq. cm 
They are not equal.

So the correct answer is (d).