How much is the painting by Professor Chen Xiwei of Central University for Nationalities?

The old man is good at landscape painting and calligraphy. He is a retired teacher of the Academy of Fine Arts. I am over 80 years old this year. How much depends on the way you get this painting. If you want to calculate by the square, as far as I know, the artist takes about 8000- 15000 yuan (the quality is slightly different)/four feet. Calligraphy costs thousands of dollars.