Answer:
otal length = 12.5 feet = 12.5 * 12 = 150 inches
Total width = 4 feet = 4 * 12 = 48 inches
We need to leave 6 inches at the ends as border. So the remaining
Length = 150 - (2*6) = 138 inches for 16 characters (CONGRATULATIONS!) which gives 8.625 inches for each character (138 inches divided into 16 parts gives 8.625 inches)
Width = 48 - (2*6) = 36 inches (Height of each Character)
Height of each character = 36 inches
Length of each character = 8.625 inches
With 6 inches border as required.
Explanation: