From 1.2 The Chinese Tribute System: The Chinese tribute system made the ownership of what
two commodities from China "cool" or a status symbol?

letter of patent

seal of rank

Explanation:

The concept of a tributary state was of great importance in East Asia, where the Chinese emperor considered himself the master of the entire civilized world. The purchase of goods brought by foreign merchants was interpreted as paying a tribute, or acknowledging his authority and selling Chinese goods to a foreign country. markets interpreted as sales.This circumvented the Confucian ban on trade.

Ais 190 b is 200c it can't be more then 100%