It is 200 because 30 is less than 50
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200
231 rounds to:0 to the nearest thousand200 to the nearest hundred230 to the nearest ten
It means add 3452 and 231 and then add 100 to that. 3452 + 231 = 3683 3683 + 100 = 3783
83 ÷ 100 × 231 = 191.73%
22 as a percentage of 231 = 100*22/231 = 9.52381 (to 5 dp).