$14$ of $39$

What general rule is applied in the Pareto classification of stock items?

$\frac{20}{80}$ rule, where $80\%$ of the items may contribute $20\%$ of the profit

$\frac{40}{60}$ rule, where $40\%$ of the items may contribute $60\%$ of the profit

$\frac{50}{50}$ rule, where $50\%$ of the items may contribute $50\%$ of the profit or vice versa

$\frac{80}{20}$ rule, where $20\%$ of the items may contribute $80\%$ of the profit