Solving two mathematical problems (solving linear equation with one variable) First: Party A and Party B want to jointly contract a project. Party A will complete the project within 30 days and Party B will complete the project within 20 days. The contract stipulates that the project will be completed within 15 days. Otherwise, a fine of 1000 yuan will be imposed for each day. Party A and Party B sign the contract after discussion (1) Under normal circumstances, can party A and Party B renew the contract? Why? (2) at present, 75% of the project is jointly carried out by Party A and Party B. because there is something urgent elsewhere, one person must be transferred. Who is more suitable to be transferred? Why? The second way: there is a home appliance store that increases the selling price of a refrigerator by 40% according to yuan, and then writes "big reward, 20% discount" in the front advertisement. After consumers complain, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the selling price of yuan per refrigerator The second question is like this: a household appliance store will increase the original price of a refrigerator by 40%, and then write "big reward, 20% discount" in the front advertisement. After consumer complaints, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the price of each ice box

Solving two mathematical problems (solving linear equation with one variable) First: Party A and Party B want to jointly contract a project. Party A will complete the project within 30 days and Party B will complete the project within 20 days. The contract stipulates that the project will be completed within 15 days. Otherwise, a fine of 1000 yuan will be imposed for each day. Party A and Party B sign the contract after discussion (1) Under normal circumstances, can party A and Party B renew the contract? Why? (2) at present, 75% of the project is jointly carried out by Party A and Party B. because there is something urgent elsewhere, one person must be transferred. Who is more suitable to be transferred? Why? The second way: there is a home appliance store that increases the selling price of a refrigerator by 40% according to yuan, and then writes "big reward, 20% discount" in the front advertisement. After consumers complain, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the selling price of yuan per refrigerator The second question is like this: a household appliance store will increase the original price of a refrigerator by 40%, and then write "big reward, 20% discount" in the front advertisement. After consumer complaints, the price department will impose a fine of 2700 yuan per refrigerator according to 10 times of the illegal income, and ask for the price of each ice box

(1) 1 / (1 / 30 + 1 / 20) = 12 can (2) a (1-75%) / (1 / 30) = 7.5 (days) B (1-75%) / (1 / 20) = 5 (days) total 75% / (1 / 30 + 1 / 20) = 9 (days) 9 + 7.5 = 16.5 (days) No 9 + 5 = 14 (days) can be adjusted a second (1 + 40%) x * 20% = 2700 / 10x = 675 / 7X is about 96.4 the second question may be wrong