The area of the banner in cm squared is 400x 85 or 34000 sq cm but a less cumbersome number is 400cm = 4m (100 cm to 1 metre) and 85 cm = 0.85m so 4m x 0.85m= 3.4 sq metres for the area of the banner in manageable units.
Answer: Visualforce page with a custom controller, how should a developer retrieve a record by using an ID
Explanation:
This is so difficult. sorry i couldn’t help!!