A variety of currencies circulated in China during the Republic of China era, most of which were denominated in the unit 'yuan'. In 1948 the People's Bank of China issued a unified currency known as the Renminbi or 'people's currency'. read more
Many countries around the world use the dollar as currency, they all have different values, ask your question again stating which country's dollar you want to know about. read more
In China the two banks that will nearly always take foreign debit cards are 1)China Construction Bank and 2) Bank of China. $1000 a week is an unbelievable amount of money in China. I don't know what kind of lifestyle you live at home, but I live in China quite comfortably for $250 (~2000rmb) a week - that includes a big apartment/etc etc in Beijing. read more