1. The problem states that the price of a game decreased from £20 to £12, and we need to find the percentage decrease. 2. Percentage decrease is given by the formula: $$\text{Percentage decrease} = \frac{\text{Original Price} - \text{New Price}}{\text{Original Price}} \times 100$$ 3. Substitute the known values: $$\text{Percentage decrease} = \frac{20 - 12}{20} \times 100$$ 4. Calculate the numerator: $$20 - 12 = 8$$ 5. Divide by the original price: $$\frac{8}{20} = 0.4$$ 6. Multiply by 100 to find the percentage: $$0.4 \times 100 = 40$$ 7. Therefore, the price is decreased by 40%.