How much is Tang Dingzhi's calligraphy, the market situation of his works, and the market situation

This painting sold for about 60,000 square feet. It's about 8000 yuan a square, because the price of calligraphy can't be found. According to the calculation, the price of calligraphy should be about per square foot 1500 yuan. Inscription: 1 Outside the cave, Wu Jia Winter Moon Snow Festival, Liu Feng painted in the shrine. 2. Liu Feng painted it. Seal: 1. Liu Feng, leisurely landscape, Gordon, Qingshan still water 2. Liu Feng