Double the present term to get the next one.
The term after 400 is 800 .
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400 * 200 = 400 * 100 * 2 = (400 * 100) * 2 = 40000 * 2 = 80000
200 percent of 400 = 800200% of 400= 200% * 400= 200%/100% * 400= 800/1 or 800
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200
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