Challenge #17: Month-over-Month Retention Rate

[paul_houghton]

Rocking through some more history

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[robbinrv]

Bit of a headache afterwards, but all done! good practice for real client problems.

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[OllieClarke]

My first Batch Macro :)

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[akuma162]

My Solution to this challenge

[jevon]

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I liked this one ;)

[jxuan]

#17 Solution

[CaraI]

I originally put the date parsing in the macro, but then decided to pull them out just in case the date formats changed.  Turns out that move matched many of the solutions directly.  The calculations around open and closed took some experimenting and validation to get right.

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[kcoulon]

Challenge solved - was on the right track but just need a little help from the solution file!  Thanks for more batch macro practice!