Isabelle Abiassi operates a popular summer camp for elementary school children. Projections for the current year are as follows: Sales revenue $8,340,000 Operating income $739,250 Average assets $4,208,000 The camps weighted-average cost of capital is 10%, and Isabelle requires that all new investments generate a return on investment of at least 15%. The camps current tax rate is 25%. At last weeks advisory board meeting, Isabelle told the board that she had up to $50,000 to invest in new facilities at the camp and asked them to recommend some projects. Today the boards president presented Isabelle with the following list of three potential investments to improve the camp facilities. Playground Swimming Pool Gym Incremental operating income $ 4,050 $ 4,896 $ 3,080 Average total assets 27,000 40,800 15,400 Calculate the return on investment, residual income, and economic value added for each of the three projects.