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June 40 sign ups July 50 sign ups

to estimate August I divide June / July (40/50) = .8

I subtract .8 from 1 giving me a growth rate of 20% (.2).

I multiple 50 * 1.2 to get an expected sign up of 60

I understand the above..now look at this

September i had 881 signups October i had 47 signups

If I want to estimate November signups this is what I'm doing

881 / 47 = 18.74 1 - 18.74 = -17.74

do i multiple 47 * -17.74? i don't think its right...can someone help me with my math here.

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    this is a software/programming site2011-11-02

2 Answers 2