I need to visit china for business, this is the second time i am going, how much for my visa?

It costs Rs2300.
You need to provide your passport and its copy, the application form attached with a passport-style photo taken recently, an invitation letter of a duly authorized unit, an invitation letter from your trade partner in PRC, the covering letter from your company, the bank statement of your company (at least recent 3 months), and copy of the Business Registration Letter of your company.