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The residents of Vegopia spend all of their income on cauliflower, broccoli, and carrots. In 2016, they spend a total of $210 for 100 heads of cauliflower, $70 for 50 bunches of broccoli, and $45 for 450 carrots. In 2017, they spend a total of $225 for 90 heads of cauliflower, $112 for 80 bunches of broccoli, and $120 for 400 carrots. Using 2016 as the base year, the CPI for 2016 is _______.