A shopping mall will increase the original price by 20% and price it again. Then it will reduce the price by 20% according to the new regulations. The selling price is 2880 yuan. What's the original price? From the date of sale, the price of a certain fruit is reduced by 20% every day compared with the previous day. Xiaoming bought 3kg the next day and 3kg the third day It costs 42 yuan twice. What's the price of this fruit on the same day? It's fast and urgent,

A shopping mall will increase the original price by 20% and price it again. Then it will reduce the price by 20% according to the new regulations. The selling price is 2880 yuan. What's the original price? From the date of sale, the price of a certain fruit is reduced by 20% every day compared with the previous day. Xiaoming bought 3kg the next day and 3kg the third day It costs 42 yuan twice. What's the price of this fruit on the same day? It's fast and urgent,

1. If the original price is regarded as unit 1, the price increased by 20% is (1 + 20%) = 1.2
After another 20% reduction, the price is 1.20 · (1-20%) = 0.96
Therefore, the original price is 2880 △ 0.96 = 3000 yuan
2. Suppose the unit price of the day is x, then the unit price of the second day is x · (1-20%) = 0.8x, and the unit price of the third day is 0.8x × (1-20%) = 0.64x
3×0.8x＋5×0.64x＝42
The solution is x = 7.5