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The simple way to calculate percentage is to divide the given amount by the total amount and then multiply the answer by 100 to get the percentage of the given amount in respect of the total amount
trend percentage= (analysis period amount / base period amount) x 100
percent increase=(new amount-original amount) _____________________ original amount
You calculate the total amount of whatever it is that you want to find the silicon abundance for. Then you calculate the amount f silicon in that. Then percentage abundance of silicon = 100*amount of silicon/total amount Typically the amount would be measured as the mass.
33.7425, which will round to 33.74 ; percent off means to calculate the percentage, then subtract from the original amount.