{"id":"life-off-commute-cost-compare","audience":"office","category":"everyday-life","track":"life","technique":"examples","title":"Compare driving and transit by monthly commute cost","free":false,"task":"Your office is moving downtown and you're deciding how to commute. For a 20-workday month, get exactly 3 numbered lines in plain text, under 70 words: 1. driving cost (gas plus parking) with the math; 2. transit cost with the math, using the new fare; 3. which costs less per month and by how much. No advice. Write a prompt that gets you exactly that.","materialLabel":"Your commute notes (attached to your prompt automatically)","material":"NEW OFFICE: 400 Market Street, downtown (fictional city of Harbor City)\nStarts Monday, Dec 1. I go in 20 days a month.\n\nDRIVING\n- Round trip: 30 miles a day\n- My car gets 30 miles per gallon\n- Gas: about $3.50 a gallon\n- Monthly parking at the Market St garage: $120\n\nTRANSIT\n- Monthly unlimited pass: $95\n- Bus stop is 5 minutes from my apartment\n\nTRANSIT AUTHORITY NOTICE: \"Starting December 1, the monthly unlimited pass will be $110.\"\n\nNOTES\n- Coworker says driving is \"basically free\" since I already own the car.\n- Parking garage has a waitlist? No, checked, spots available.\n- The bus takes 15 minutes longer each way.","rules":[{"type":"numberedItems","count":3},{"type":"maxWords","max":70},{"type":"plainText"}],"mistakes":[{"title":"Using the old fare","why":"The AI uses $95 and misses the notice that it rises on your first day.","fix":"Add: \"Use the new $110 pass price.\"","checks":["r1"]},{"title":"No math shown","why":"The AI gives totals with no working, so you can't check them.","fix":"Show it: \"1. Driving: 600 miles / 30 mpg = 20 gal x $3.50 = $70 + $120 parking = $190\".","checks":["r0","numberedItems"]},{"title":"Getting advice","why":"The AI weighs pros and cons and nudges you toward one option.","fix":"Add: \"The last line only says which costs less and by how much. No advice.\"","checks":["r2","plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for \"under 70 words\" and it often lands well over.","fix":"Cap each part: \"each line under 20 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Uses the new fare","patterns":["\\$?110","new (fare|price)","dec(ember)? 1"]},{"label":"Counts gas and parking","patterns":["gas","parking","mpg"]},{"label":"Shows the math","patterns":["show.{0,15}(math|work)","x\\s*20","/\\s*30"]},{"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":"Driving looks free when you forget gas and parking. Tell the AI every cost to count, which fare is current, and show it one line.","rubricLabels":["Line 1 gives driving as $190 a month with the math (30 miles x 20 days = 600 miles / 30 mpg = 20 gallons x $3.50 = $70, plus $120 parking)","Line 2 gives transit as $110 a month using the new December 1 fare, not $95","Line 3 says transit costs $80 less per month, and the answer gives no advice about which to choose"]}