A lightweight Flutter application will calculate the final price of a custom bag order the moment I type in size, quantity, material, and any extra cost factors. The interface should stay clean and minimalist so a first-time user can grasp it instantly. Core expectations • Dart code must be clear, well-structured, and fully commented so I can extend formulas later. • The initial build targets Android; if one codebase can be compiled for iOS too, that’s a welcome bonus but not essential. • All calculations need to be precise—no rounding surprises—so unit tests (or at least a reproducible formula sheet) are useful. Deliverables 1. Fully functional Flutter project folder 2. Release-ready Android build (.apk or .aab) 3. Any scripts or documentation needed to recompile and publish When you reply, a quick note on similar Flutter work you have shipped, the toolchain you prefer (Flutter stable channel, null-safety, etc.), and your estimated cost and schedule will help me lock things in fast.