2 (1) average production of x pieces per day 5X=650 X= 130 pieces per day 130 pieces. All tasks are 650 divided by 0.25=2600 pieces.

2600 divided by 130 equals 20. 20-5= 15 takes 15 days.

(2) The selling price is 100 times 1.5 yuan, and the profit from selling 50 pieces is (150- 100) times 50 yuan.

The remaining 50 pieces were sold in 75 yuan at a discounted price, and the loss (100-75) multiplied by 50 is 1250 yuan.

2500 is greater than 1250, so the retailer makes a profit.

3 (1) processed according to this size specification, the cloth used to make 30 coats is three-fifths of this batch of cloth. 50 divided by 30

Therefore, silk fabrics used for tops can be used for skirts, and 60 times three-fifths equals 36.

(2) 1-(20 divided by 50)-(20 divided by 60)= one fifteenth.

All the remaining silk fabrics are used to make skirts. One fifteenth times sixty equals four.

4 (1) 120 yuan minus (120 times 0. 8) The common factor 120 times (1-0.8) is equal to 24 yuan.

(2) This ... calculates several methods to compare the sizes. ...