1. A shopping mall launched a promotion activity, and some goods were sold at a discount. My mother spent 240 yuan on a dress at the mall, which was cheaper than the original price by 60 yuan. How much is the discount on this dress?

From May 2nd1day, the toy factory will produce 3000 toys for children in welfare homes before Children's Day. In the first six days, it produced an average of 250 toys a day, and the rest will produce an average of 300 toys a day. Calculation: Can they finish the production task on time?

3. Master and apprentice process the same kind of parts at the same time. After 2.5 hours, the master processed 30 more than the apprentice. Apprentices are known to process 80 pieces per hour. How many pieces does the master process per hour?

4. According to the regulations of the state, the personal income adjustment tax shall be paid for the payment of articles and works published by individuals. The calculation method is as follows: (1) The manuscript fee is not higher than that of 800 yuan; (2) If the capital contribution is higher than that of 800 yuan but not higher than 4,000 yuan, the part exceeding 800 yuan shall be taxed at 14%. Professor Wang got a fee for publishing a book. He paid a tax of 392 yuan. How much is Professor Wang's fee?

The level of social informatization is getting higher and higher, and the computer network has entered the homes of ordinary people. A city telecommunication bureau provides three payment methods for computer internet users (each user only needs to choose one of them): the first one pays according to the actual internet time, with 3 yuan per hour; Second, the monthly fee system, 48 yuan every month. The use time is 20 hours, and the 3 yuan will be paid every hour for the excess; The third method is also a monthly subscription system, and 78 yuan is paid every month, with unlimited online time. In order to choose the appropriate payment method, a user recorded the time of surfing the Internet for 7 consecutive days, as shown in the following table. (unit: minutes)

Date: 1 234 567

Online time 62 40 35 74 27 60 80

Please help this user to decide which payment method is more suitable through calculation.

6. Xiaojie reads a story book. The ratio of pages she has read to the remaining pages is 2: 3. Xiao Jie's good friend Xiaoling found through calculation that the number of pages Xiao Jie read was 28 pages less than the total number of pages in this book. How many pages does this story book have?