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?

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.