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# Easy maths question for Biology help? watch

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1. 1) Calculate the rate of change in the percentage of cells between 10 and 90 years of age.

Ok so at 10 years it is 98%
and at 90 years it is 26%

The difference is 72%.
But how do I work out the rate?
2. Divide the percentage difference by the time difference (in years)
3. So its just 72 / 80?
4. yep
5. (Original post by Marykate5)
So its just 72 / 80?
(if you want the rate in terms of % change per year)

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Updated: March 19, 2009
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