It is 211. What it gets rounded to will depend on the degree of rounding.
It is: 210/387*100 = 54.3% rounded to 1 decimal place
To convert 1 out of 210 to a percentage, divide 1 by 210 and then multiply the result by 100. This calculation gives approximately 0.4762%. Therefore, 1 out of 210 is about 0.48% when rounded to two decimal places.
210
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206 rounded to the nearest 100 is 200. Rounded to the nearest ten is 210.
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No need; it is already rounded.