{"id":"dat-par-cereal-unit-price-card","audience":"parents","category":"decisions","technique":"context","title":"Compare cereal sizes by unit price with your store discount","free":false,"task":"You're deciding which cereal box to stock up on. Your loyalty card takes 10% off the store brand at checkout (the shelf tag doesn't show it). Write exactly 3 numbered lines, each showing price ÷ ounces = cents per ounce (apply the discount first where it counts), then one unnumbered last line: Buy: [option]. Plain text, under 60 words.","materialLabel":"Your shelf-price notes (attached to your prompt automatically)","material":"CEREAL PRICES - photos from Saturday's shopping\n\nToasty O's (name brand), 18 oz box | $4.68\nFreshway store brand toasted oats, 20 oz box | $5.00\nToasty O's warehouse pack, 40 oz (2 bags) | $9.60\n\nNotes:\n- Kids say store brand \"tastes the same\" (Leo) and \"worse\" (Mia). Tie.\n- Warehouse club membership is already paid for this year.\n- Freshway had a \"Buy 2 get 1\" sign on granola, not cereal.\n- Pantry has room for about 3 big boxes.\n- The loyalty card discount shows up only on the receipt, not on the shelf tag.\n- Store brand box says \"compare to Toasty O's\" right on the front.\n- Warehouse club is a 20-minute drive; we go there about once a month anyway.\n- Cereal goes fast in our house: about one big box a week with two kids.","rules":[{"type":"numberedItems","count":3},{"type":"plainText"},{"type":"maxWords","max":60}],"mistakes":[{"title":"Not mentioning the card","why":"The AI uses shelf prices, so the warehouse pack wins.","fix":"Add: \"My card takes 10% off the store brand.\"","checks":["r0","r2"]},{"title":"Not asking to see the work","why":"Unit prices are easy to fumble without the division shown.","fix":"Add a line to copy: \"1. Name brand: $4.68 ÷ 18 = 26¢/oz\"","checks":["r1","numberedItems"]},{"title":"Getting a shopping guide","why":"The AI adds tips about bulk buying and taste tests.","fix":"Add: \"Then one line: Buy: [option]. Nothing else.\"","checks":["r2"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each line: \"each line under 14 words.\"","checks":["maxWords"]},{"title":"Forgetting where it goes","why":"AI loves markdown tables and bold, which show up as clutter in a shopping list app.","fix":"Add: \"Plain text, no bold, headings or tables.\"","checks":["plainText"]}],"promptHints":[{"label":"Mentions the discount","patterns":["10\\s*%","card","discount"]},{"label":"Asks for unit price","patterns":["per (ounce|oz)","unit price","cents"]},{"label":"Asks to show the math","patterns":["show (the |your )?(math|work)","x \\$|\\bx\\b.{0,10}=","calculation","step"]},{"label":"Sets a word limit","patterns":["\\d+\\s*words","word (limit|count)","under \\d+"]},{"label":"Asks for plain text","patterns":["plain","no bold","no markdown","no formatting","no (headings|tables)"]}],"hint":"The shelf tag isn't what you'll pay. Tell the AI about your card and ask it to show each unit price.","rubricLabels":["Applies the 10% card discount to the store brand: $5.00 − 10% = $4.50 ÷ 20 = 22.5¢ per ounce (23¢ rounded is fine)","Name brand is $4.68 ÷ 18 = 26¢ per ounce and the warehouse pack is $9.60 ÷ 40 = 24¢ per ounce","The last line picks the store brand, after the three lines, with no intro or shopping tips"]}