Answer all questions with explanation.

Reynold is making a scale model for a rectangular skyscraper with dimensions 200 ft. x 300 ft. x 600 ft. as a part of his New York City diorama. He takes a singular plywood plank with dimensions 4 ft. x 8 ft. x 3/4 in. out of his storage and plans to use that to construct his model.

If he wants to use as much of the plywood plank as possible, what is a good scale factor he can utilize for constructing his model? How much plywood is left after the model's construction with your scale factor?