3, 306 ÷ 360 = 85% ...8.5 fold 4,2800-2800× 85% = 420 (yuan) children's bookstores are cheaper.

Page 7 answers

1, 360×80%=288 (yuan) 440×75%=330 (yuan) 2 100×88%= 1848 (yuan) 2, (1) 5.

There are many ways to buy, including buying one cake, two cakes and three cakes, which are omitted here. 3.5800×80%×90%=4 176 (yuan)

Page 8 answers

1, 1500×80%= 1200 (yuan) 900×80%=720 (yuan) 580×80%=464 (yuan) 2,4850-4850× 90%.

Page 9 answers

1 、( 1)85%x， 1.85x(2)75%x，0.25x2、30、20

3、X+70% X = 5 10X = 30070% X = 2 10

A: There are 30 white rabbits and 2 black rabbits10.

4, 24 ÷ (1-20%) = 30 (only) 30×20%=6 (only) Answer: 30 white rabbits and 6 black rabbits. 5. 126( 1+80%)= 70 (kWh) 80%×70=56 (kWh)