Question 1: P=30+x The solution to the first question should be said to be not difficult. At this time, the market price in 30 yuan rises by X yuan every day and X yuan after X days, so the expression is listed as p = 30+X.

Question 2: Q = (x+30) (1000-10x)-400x. The second question is this. The daily selling price is the same as the first question. X+30 yuan, then the number of kilograms sold after X days is 1000- 10x, and the daily expenses are 400 yuan, so the sales volume is reduced by 400 times.

I hope the landlord will adopt it. Thank you.