How much is Du's calligraphy per square foot?

Du, male, from Ankang, Shaanxi Province, won the second prize of the second Stars Art Award in Shaanxi Province, the first prize of Shaanxi People's Calligraphy Exhibition, the national calligraphy seal cutting exhibition of Liu Gongquan Cup in China, the Excellence Award of the second Guanyinshan Cup National Calligraphy Art Exhibition of Calligraphy Newspaper, the third international painting and calligraphy art festival of Yongle Palace in China and the second calligraphy TV competition of Lanting. Provincial members are generally 600- 1000 yuan per square meter for reference.