what is their estimated pepoulation?
Approximately 1,370,536,875 as per the national census of 2010
China
The national census of 2010 recorded the population of the People's Republic of China as approximately 1,370,536,875. 
the production of which substance increased during the han dynasty coins, iron how was the estate management during this time? In the early Eastern Han, Emperor Ming passed laws which prohibited those involved in agriculture from simultaneously engaging in mercantile trade. These laws were largely ineffective since wealthy landowners and landlords made significant profits from the trading of goods produced on their estates. where was this dynasty seen? China which period was this seen? 202 BC–220 AD what all variations were made in currency during this time? Token money notes made of embroidered white deerskin were used to collect government revenues; three tin-silver alloy coins; The bronze "wushu" coin what can you tell me about the aforesaid country? A country in East Asia and it is the world's most populous country. where did it get its name from? Its origin has been traced through Portuguese, Malay, and Persian back to the Sanskrit word "Cīna", used in ancient India.
wiki:1621850
China [SEP] Demographics
The national census of 2010 recorded the population of the People's Republic of China as approximately 1,370,536,875. About 16.60% of the population were 14 years old or younger, 70.14% were between 15 and 59 years old, and 13.26% were over 60 years old. The population growth rate for 2013 is estimated to be 0.46%. China used to make up much of the world's poor; now it makes up much of the world's middle class. Although a middle-income country by Western standards, China's rapid growth has pulled hundreds of millions—800 million, to be more precise—of its people out of poverty since 1978.