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Compute break-even units and margin of safety at the new price
- 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 running a simple break-even for one product. Write a prompt for plain text with lines starting "Contribution:", "Break-even units:", "Break-even revenue:" and "Margin of safety:", each with the math. Use the current price and round break-even units up to a whole unit. Margin of safety is forecast units minus break-even units, also as a percent of forecast, to one decimal. Under 70 words. No bullets or numbering.
Common mistakes when you ask AI for this
- Using the old price. The AI uses $40 and the August 3,000 units. Try: Say: "Use the current price, $42."
- Dropping the optional marketing. The AI removes $6,000 from fixed costs. Try: Add: "Keep all $48,000 in fixed costs."
- Rounding down. The AI rounds 2,666.7 to 2,666 or leaves a decimal. Try: Add: "Round break-even units up to a whole unit."
- 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
- Uses the current price
- Rounds up
- Keeps all fixed costs
- Caps length
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