Part A you would use 200-L ( since you have 400 feet total 200 feet would equal length plus width)
Part B 200 - 80 = 120
Part C 200-90 = 110
area = 90 x 110 = 9900 square feet
depending on how many green and purple there are, lets say 4, and there are 10 other colors, it would be 4/10 so its 40%
