A shop A will buy stock for its monthly shop needs. The average purchase of shop A is at most 1000 units per month, while at least only reached 100 units. On the monthly report profit maximum sales per month reach $ 1,000, while the minimum profit is $500. While the maximum monthly sales usually reach 2000 units and minimum 1000 units. Construct a Tsukamoto fuzzy inference system for this case, if the minimum input variable consists of 3 sets and the output var consists of at least 2 sets.