Final answer:
The percentage reduction in price for the HD TV is 15%.
Step-by-step explanation:
To calculate the percentage reduction, you need to find the difference between the original price and the reduced price, and then divide that difference by the original price. In this case, the difference is £480 - £408 = £72. So, the percentage reduction is (72/480) x 100% = 15%. Therefore, the correct answer is b. 15%.