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Show how in-year hires create a bigger full-year cost next year

  • For FP&A and financial analysts
  • You practice Catching mistakes and made-up facts
  • Time about 5 minutes
  • Level Intermediate

About this exercise

You're explaining annualization to the CFO. Write a prompt for plain text with lines starting "FY26 months:", "FY26 cost:", "FY27 full year:" and "Annualization:", each with the math. Every hire costs $10,000 per month. Count the start month as a full month, and ignore attrition and raises. Under 70 words. No bullets or numbering.

Common mistakes when you ask AI for this

  • Mentioning attrition. The AI adds a caveat that one hire might leave. Try: Add: "Do not mention attrition or raises."
  • Counting the hires as 12 months. The AI uses 4 x 12 for FY26 as well. Try: Say: "FY26 months: add each hire's months in FY26."
  • Annualization as FY27 total. The AI reports $480,000 as the annualization. Try: Add: "Annualization = FY27 full year minus FY26 cost."
  • Markdown extras. The AI adds bold labels, headings and a closing note. Try: Say: "Plain text, no bold. Output only the lines asked for."
  • Trusting the AI to count words. AI is bad at counting and runs past word limits. Try: Ask for fewer words than the real cap and keep each line short.

What a strong prompt includes

  • Names the four lines
  • Gives the monthly cost
  • Asks for arithmetic
  • Bans attrition and raises
  • Caps length

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