It costs a certain amount of money to buy 50 Jin of flour, and fry deep-fried dough sticks with flour. Now, the price of a deep-fried dough stick is 1 yuan and 50 cents. Roughly, a Jin of flour can fry 30 to 40 fruits, and the price is 45 yuan to 60 yuan. Let's take one as 50 yuan.

Fifty catties is 250 yuan, and after deducting 50 yuan for flour, it is 200 yuan. This is the least profit, and it should be between 200 yuan and 350 yuan.