Reason: It costs 20 yuan to get a silver card. Counting money from 20 yuan and saving money from 2 yuan, Li Ming spent 20+2 = 22 yuan less than the original price on this book. How did you save 22 yuan? Because the silver card can enjoy a 10% discount, that is to say, the discount for this book that Li Ming paid less is 22 yuan, the discount is 22 yuan, and the discount is 22 ÷ 10% = 220 yuan.
2. What Wang Hao said is reasonable. Because the original price of the book is 220 yuan, if the gold card is 20% off, it can save 220 × 20% = 44 yuan, and after deducting 30 yuan, it can save 14 yuan. The bank card only deposits 2 yuan money. So it's cheaper to get a gold card.