{"id":"life-hs-phone-plan-compare","audience":"high-school","category":"everyday-life","track":"life","technique":"examples","title":"Compare two phone plans by the cost of a full year","free":false,"task":"You're paying for your own phone plan now and found two prepaid options. Compare the full cost of 12 months, including any one-time fee and the sale price. Get exactly 3 numbered lines in plain text, under 70 words: 1. Plan A's 12-month cost with the math; 2. Plan B's, same shape; 3. which is cheaper and by how much. No tips. Write a prompt that gets you exactly that.","materialLabel":"The two plans (attached to your prompt automatically)","material":"PLAN A - Brightline Prepaid (fictional)\n$25/month, 10 GB data\nOne-time SIM activation fee: $15\n\nPLAN B - Nimbus Mobile (fictional)\n$30/month, unlimited data\nNo activation fee\nSALE: first 3 months are $15/month, then $30/month\n\nFINE PRINT ON PLAN B'S PAGE: \"Sale price applies to the first 2 months only.\" (updated Nov 1)\n\nMY NOTES\n- I use about 6 GB a month.\n- Friend says unlimited is always worth it.\n- Mom says I have to stay under $350 for the year.","rules":[{"type":"numberedItems","count":3},{"type":"maxWords","max":70},{"type":"plainText"}],"mistakes":[{"title":"Missing the fine print","why":"The AI uses the 3-month sale from the headline.","fix":"Add: \"Use the fine print: sale for 2 months only.\"","checks":["r1"]},{"title":"Comparing monthly prices","why":"The AI compares $25 and $30 and ignores the fee and sale.","fix":"Say: \"Compare 12 months, with the fee and the sale.\"","checks":["r0","r1"]},{"title":"No math shown","why":"The AI gives totals without the working.","fix":"Show it: \"1. Plan A: $25 x 12 = $300 + $15 fee = $315\".","checks":["r0","numberedItems"]},{"title":"Getting tips","why":"The AI echoes your friend about unlimited data.","fix":"Add: \"No tips. Line 3 only says which is cheaper.\"","checks":["r2","plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for \"under 70 words\" and it often lands well over.","fix":"Cap each part: \"each line under 16 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Uses the fine print","patterns":["fine print","2 months","two months","updated"]},{"label":"Compares a full year","patterns":["12 months","year","annual"]},{"label":"Shows the math","patterns":["x\\s*12","show.{0,15}(math|work)"]},{"label":"Sets the number of lines","patterns":["\\b(3|three)\\b.{0,20}(lines?|numbered|items?|steps?)"]},{"label":"Sets a word limit","patterns":["\\d+\\s*words","word (limit|count)"]}],"hint":"Monthly prices hide fees and short sales. Tell the AI to cost the whole year, which sale terms are real, and show it one line.","rubricLabels":["Line 1 gives Plan A's 12-month cost as $315 with the math ($25 x 12 = $300 + $15)","Line 2 gives Plan B's 12-month cost as $330 using the 2-month sale from the fine print ($15 x 2 + $30 x 10), not $315 from a 3-month sale","Line 3 says Plan A is cheaper by $15, and the answer gives no tips about data or which to choose"]}