How to calculate emigration rate

“The total emigration estimate can be used to calculate a 10-year emigration rate by dividing the total estimate by the population observed at time 1 and annual emigration rates can be calculated by multiplying the 10-year estimate by 1/10.”

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I think the answer is individual paragraphs because you break it up so after the whole essay you move to paragraphs than sentences then words then punctuation so that its easier to find errors.