Create one complete landscape 16:9 Chinese concept slide, S05 of the same fictional campus reuse-service pitch. Keep the warm bright editorial identity from S01, but let this page feel like a considered financial note spread, not the cover, route map, process, or a dashboard.

Visual approach: a sunlit shared worktable with one used desk lamp, a pencil, and a large unbranded handmade paper ledger sheet. Use a strong asymmetrical composition: the paper ledger itself anchors the page, with a very clear typographic equation and just enough photographic texture around it. A few terracotta and deep-green marks may guide the eye. This is a hypothetical example calculation, not a real account, receipt, investor document, or measured business record. No logo, official stamp, customer quote, cash photo, growth graph, market-size chart, or invented financial metric. Do not use a grid of cards. Keep the arithmetic visually unmistakable and legible.

Render only these exact Chinese phrases and amounts, with all signs, units, and arithmetic preserved. Do not add any other readable text:
主标题：先把小账摊开，再判断模式能否跑通
核心句：示例测算：单月收入假设 ¥150，成本估算 ¥450。
收入假设：收入假设｜30次 × ¥5/次 = ¥150
成本假设：成本假设｜耗材 ¥90 + 运送 ¥120 + 运营工时折算 ¥240 = ¥450
示例差额：示例差额｜¥150 − ¥450 = −¥300
优先验证：优先验证｜愿付金额 · 单件运营耗时 · 周转率
页脚说明：示例测算 · 非真实经营数据

Make ¥150 income, ¥450 cost, and −¥300 difference clearly distinct but connected by the arithmetic. Keep every label comfortably legible and inside safe margins. One complete presentation slide image only, no mockup, no multiple-page collage, no promise of profitability.