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#1
May 10th, 2007, 04:29 PM
posted to microsoft.public.excel.worksheet.functions
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# of iterations
I am trying to figure how many iterations it takes 100 to go below 50 with a
decay rate of 20%. i.e. 100-(100*.8)=80 then 80-(80*.8)=64...and so on. I am trying to set this up in one cell. Thanks. 
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#2
May 10th, 2007, 04:41 PM
posted to microsoft.public.excel.worksheet.functions
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# of iterations
Hi, Rick,
I am trying to figure how many iterations it takes 100 to go below 50 with a decay rate of 20%. i.e. 100-(100*.8)=80 then 80-(80*.8)=64...and so on. I am trying to set this up in one cell. Thanks. I think you're looking for this: =LN(0.5)/LN(1-A1) Where your rate, 0.2 in this case, is stored in A1. Peace, --Carl
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