1, according to each 22 yuan, buy three copies and get 1 copy. The price of four copies is 66 yuan.

2. A * * * needs to buy 120 copies. Divided by 4 parts, 120 parts equals 30, and multiplied by 66 to get 1980 yuan. To sum up, this is the calculation method of how many books Mr. Li 22 yuan should buy, each book 1 book.