The answer to this is really highly dependent upon the type of business, but even more so the developmental stage of your business. 50% is very, very high except in the earliest startup stage. In startup you have to develop the product before you have revenues, so the development numbers can be quite skewed early on. 20% is probably low if you really are considering all sales and marketing expenses, including salaries.
Phil Morettini
PJM Consulting
Moretti on Management Blog
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