costData = { const data = []; // ✅ NEW: Compute what ownership will be at sellPoint const ownershipAtSellPoint = (() => { let o = 0; if (sellPoint < 12000) o = 100; if (sellPoint >= rebuildPoint && sellPoint < rebuildPoint + 12000) o += 75; return o; })(); // ✅ NEW: Figure out how high maintenance must be to hit total=185 const endMaintenance = 110 - ownershipAtSellPoint; for (let h = 0; h <= 30000; h += 100) { if (h === rebuildPoint) continue; const tBefore = h / rebuildPoint; const tAfter = (h - rebuildPoint) / (sellPoint - rebuildPoint); // --- Maintenance Cost Logic --- const maintenance = h < rebuildPoint ? (85 - 10) * tBefore ** 4 + 10 : h <= sellPoint ? (endMaintenance - 30) * tAfter ** 2 + 30 : 75; // --- Ownership Cost Logic (Updated) --- let ownership = 0; // 100 before 12,000 hours if (h < 12000) { ownership = 100; } // +75 only if in the rebuild window but before the sell point if (h >= rebuildPoint && h < Math.min(rebuildPoint + 12000, sellPoint)) { ownership += 75; } data.push({ hours: h, maintenance, ownership, total: maintenance + ownership }); } const lastBeforeHours = rebuildPoint - 0.01; const firstAfterHours = rebuildPoint + 0.01; let ownershipBefore = 0; if (lastBeforeHours < 12000) { ownershipBefore = 100; } let ownershipAfter = 0; if (firstAfterHours < 12000) { ownershipAfter = 100; } if ( firstAfterHours >= rebuildPoint && firstAfterHours < Math.min(rebuildPoint + 12000, sellPoint) ) { ownershipAfter += 75; } const tBeforeStep = lastBeforeHours / rebuildPoint; const tAfterStep = (firstAfterHours - rebuildPoint) / (sellPoint - rebuildPoint); const lastBefore = { hours: lastBeforeHours, maintenance: (85 - 10) * tBeforeStep ** 4 + 10, ownership: ownershipBefore }; lastBefore.total = lastBefore.maintenance + lastBefore.ownership; const firstAfter = { hours: firstAfterHours, maintenance: (95 - 30) * tAfterStep ** 2 + 30, ownership: ownershipAfter }; firstAfter.total = firstAfter.maintenance + firstAfter.ownership; data.push(lastBefore, firstAfter); data.sort((a, b) => a.hours - b.hours); return data; }