equations

• revenue

  price x quantity sold
• total costs

  fixed costs + variable costs
• total variable per unit costs

  quantity sold x variable costs
• profit

  total revue - total costs
• gross profit

  revenue - cost of sales
• net profit of business

  gross profit - cost of running
• break even

  fixed cost / (selling price - variable costs)
• margin of safety

  actual sales - break even sales
• net cash flow

  cash inflow - cash outflow
• average rate of return

  annual average profit / cost of investment x 100
• gross profit margin

  gross profit / revenue x 100
• net profit margin

  net profit / revenue x 100