Here are some formulas that may be useful for Edexcel GCSE Business paper 1:

1. Gross profit = Revenue - Cost of goods sold
2. Net profit = Gross profit - Expenses
3. Profit margin = (Net profit / Revenue) x 100
4. Break-even point (in units) = Fixed costs / (Selling price per unit - Variable cost per unit)
5. Break-even point (in revenue) = Fixed costs / Contribution margin ratio
6. Contribution margin ratio = (Selling price per unit - Variable cost per unit) / Selling price per unit
7. Return on investment (ROI) = (Net profit / Initial investment) x 100
8. Total costs = Fixed costs + Variable costs
9. Average cost per unit = Total costs / Number of units produced
10. Revenue = Price per unit x Quantity sold

These are just a few examples of formulas that may be relevant to the Edexcel GCSE Business paper 1. It is important to review the specific syllabus and past papers to ensure you are familiar with all the necessary formulas for the exam.