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But due to science and technology content being low , the product 's sales price on the international market is 20 - 30 % lower than the normal price , and can only return more than 1 billion US dollars in foreign currency each year .
 20 - 30 %, 1 billion US dollars
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 20 - 30 %, 1 billion US dollars