For figuring out what profit you may get from a 1% increase in conversions, use the form with the data you currently have, noting the calculated entries. Then run thru the calculation again and increase the number of conversions by .01 - note the change in Total Profit at the bottom, and other calculated pieces of the form.
This idea for this metric analysis comes directly from a book by Brian Clifton
'Advanced Metrics with Google Analytics". All mistakes are my own.

Edward worked at Lawrence Berkeley Laboratory in the hills of Berkeley Ca in the 70's, where and when the internet backbone was being developed (DARPA). He worked in operations and then as a consultant with scientists and researchers in the consulting office. He debugged their programs and jobs. He also worked in the business department for several years programming in Fortran, Cobol, Real CICS, pascal, C,C++ and Oracle and Informix 4gl's and all the Unix shell languages and the lab's Vaxen and Unices and the connection to the Cray.He worked at various corporations in San Francisco as a freelancer for 12 years. Higher Source Web Sites started developing web sites in 2001, while in the real estate business. He started blogging and developing sites for his colleagues and his company, then other Real Estate companies. His background in business programming, database administration, & software development made staying within the soft technologies more appealing than other choices. He lives in Corvallis Oregon with his wife Pam and several doggies.
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