Chongyi Zhangyuan Tungsten Industry Co., Ltd. offers the following long-term quotations for the second half of August (the above unit prices include 13% value-added tax):

1. Black tungsten concentrate (WO3 ≥ 55%): 119,500 yuan/standard ton, an increase of 2,500 yuan/standard ton compared with the last round of quotation;

2. White tungsten concentrate (WO3 ≥ 55%): 118,000 yuan/standard ton, an increase of 2,500 yuan/standard ton compared with the last round of quotation;

3. Zhongtungsten ammonium metatungstate (national standard zero grade): 181,000 yuan/ton, an increase of 3,500 yuan/ton compared with the last round of quotation.