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Q: Why has carbon increased by 30 percent in the last 150 years?
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What percent has the obesity rate among adults increased in the US in the last ten years?

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You have the current volume of sales and percent change vs a year ago but you need to calculate the year ago volume is there a formula or macro to get this done?

If I get this right you know the volume of sales for this year and know the percentage that it changed since last year and need to know the volume of last year?First, you need to know what percent of last years volume that this years volume is, if not ...let's say it increased by x% then this year the volume is 100+x% of last year orif it decreased by x% then this years volume is (100-x)% of last yearSecond,volume this year = percentage change* last years volumepercentage means per 100 and "of" means multiplyso for example if this year the volume is 150 and it increased by 50%then your percentage of last year is 150150 = 150/100 * last years volume150 = 1.5 * last years volume150/1.5 = last years volume100 = last years volumeHope this helps..


Has atmospheres carbon dioxide changed over last 150 years?

Yes, atmospheric carbon dioxide concentrations have increased significantly over the past 150 years due to human activities such as burning fossil fuels and deforestation. This increase in carbon dioxide is a major driver of climate change and is contributing to global warming.


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