How much is the calligraphy written by the painter Duan?

About 1500 a flat foot. My friend knows him. We are Beijing Juxiange Painting and Calligraphy Institute. Baidu, you can find us. Ordinary calligraphy and painting mounted 20 yuan. It can be decorated directly or given as a gift. Such as mountains and rivers peony. Plum blossom, calligraphy, etc. 300 yuan is famous.