1. **State the problem:** We need to find the percentage increase in the number of individual packages from 20 to 28. 2. **Formula for percentage increase:** $$\text{Percentage Increase} = \frac{\text{New Value} - \text{Original Value}}{\text{Original Value}} \times 100$$ 3. **Apply the values:** $$\frac{28 - 20}{20} \times 100$$ 4. **Calculate the difference:** $$\frac{8}{20} \times 100$$ 5. **Simplify the fraction:** $$\frac{\cancel{8}}{\cancel{20}} \times 100 = \frac{2}{5} \times 100$$ 6. **Calculate the percentage:** $$\frac{2}{5} \times 100 = 40$$ 7. **Answer:** The number of individual packages increased by **40%**.