You have to build the valuation model for one plant and study the sensitivity of the plant value with respect to: Product selling prices (the basic price is $6.60 per square meter; you study the moves of +/- $0.60) Discount rates (in the range from 15% to 25%, at a step of 5%) Then you have to expand the model to study the scaled-up project of building 5 plants either at once or sequentially