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in 1990, world rice production was 350 million tons. in 1999 it had risen to 400 million tons . what was the percentage increase in world rice production between 1990 and 1999? 

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In 1990 rice production= 350 million tons 

In 1999 rice production = 400 million tons 


400-350= 50 million ton increase 

50/350=.1428   To calculate the percentage increase you divide the total amount increased by the initial amount to determine the percent. 

Therefore the world rice production increased by approximately 14% from 1990 to 1999. 
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