How much is Luo Wuliang's calligraphy?

Luo Wuliang, male, 1925, member of China Calligraphers Association and Xinjiang Calligraphers Association. He used to be honorary vice chairman of Xinjiang Calligraphers Association. He loved calligraphy since he was a child, and then he specialized in Wei Kai. His works are quite common in the collection market. 12 years, my friend bought a four-foot banner, which was 40,000 yuan at that time, but according to his recent fame, it is now 4000- 12000 yuan, depending on the work.