Solution 1:1000/800 = 1.251200/800 =1.5 So every time a generates1,c generates1.25. Because1* 3 >; 2 * 1.25 & gt； 1.5* 1.5, so A is the best, but A can't produce 200 pieces every day, so we have to use the best except A, that is, B, 200* 1.25=250 pieces, with 250 pieces of B, and the arrangement is 600 pieces of A and 250 pieces of B.

Let others do the next question, I don't have enough time.