You have 7 projects. Each project cost you $1,000. Even if you have $1900, you can only invest in one project. These projects have different revenues. Project A will generate $3000 revenue. B will generate $1200 revenue. C will generate $800 revenue. D will generate $900 revenue. E will generate $1500 revenue. F will generate $2100 revenue. G will generate $600 revenue.
Question: Make an optimization table (Marginal cost, Marginal Revenue, and Profit columns must be provided) then according to the table, use the level-optimization and marginal-optimization method to find the optimal choice.