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.
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Take percent abundance times atomic mass for each isotope then add all up for average atomic mass.
To calculate the Percent to Plan, you can first substitute the variable X for the percent and the variable Y for the Plan, and then you can solve for the end rate of percent to plan easily.
Please give me the formula on how to calculate % IBW. Thank you
99
not by asking it here! Percent means hundredths. You calculate (5/100) x 30,000, or equivalently, 0.05 x 30,000.