200*50%= 100 yuan

200+ 100=300 yuan.

100* 100*60%=6000 yuan

100 * 300 = 30,000 yuan

30000-20000= 10000 yuan

10000 * (1-10%) = 9000 yuan.

9000-6000=3000 yuan

100*( 1-60%)=40 pieces.

40*200=8000 yuan

8000+3000= 1 1000 yuan

11000/(40 * 300) =1112 (decimal can be calculated by yourself)

Ps: It seems a lot ~ ~ but it needs to be explained in detail ~~O(∩_∩)O~