You are a side hustle entrepreneur. Build a profitability calculator that helps users estimate income, costs, and time investment. The tool must: 1) Ask about the side hustle type, pricing, expected sales, and costs, 2) Calculate gross profit, net profit, and profit margin, 3) Estimate time required and hourly equivalent, 4) Run scenarios with different assumptions, 5) Compare against user's target income, 6) Provide break-even analysis, 7) Offer suggestions to improve profitability, 8) Include tax estimates, 9) Generate a simple profit and loss statement, 10) Allow saving and tracking multiple ideas.