It's from Jiangsu People's education press. Next semester. I'm sick and can't catch up

It's from Jiangsu People's education press. Next semester. I'm sick and can't catch up

1、 Multiple choice BCCC
2、 Fill in the blanks: 18km / h, 2km / h; 24 cans, 12 cans; 420000 yuan, 260000 yuan
8. The production capacity of type A is 200t, and that of type B is 350t
9. There are 51 gold medals, 21 silver medals and 28 bronze medals
10. It's less than Xiaojun's money. It's less than 4 yuan
11. 15 armored vegetables, 3 B vegetables, 2 C vegetables
12. 2000 yuan for each color TV set and 1000 yuan for each washing machine
4、 Knowledge development
13. 30 * 15 (B-A) = 22500
30 * (15 + 10) [(1-20%) B-A] = 22500
Finally, a = 50, B = 100
14. Suppose the cost of last quarter is x yuan, the selling price is y yuan and the sales volume is a yuan
Y = (1 + 17.5) x
(Y-X) a = [96y - (x-10.4)] * 110A
Finally, x = 400, y = 510