Quandaries
and Queries 

Math Sage, Let's say I have a list of different possible investements, and the list shows me my cost, and how much each investment will sell for. In order to compare the investments and put them in order of relative profitability, I would want to sort them by their profits as percentages of what? Also, if each investment had an equal probabilityof losing exactly 10% of the sell price before I sold would that have any relevance to the way I would calculate it? Thanks for you help, and sorry for sending you a word problem with only one number in it. :) Max 

Hi Max, This is a strange set of hypothesis  in particular, it is not clear
whether the However, playing the mental game, it turns out a ranking of relative profitibility would be the same whether you took the 'profit' (sell  buy) as a percent of the buy price in every case, or as a percent of the sell price in every case. You are not trying to describe the profit, but to rank profits for several investments. The absolute numbers would be different, but the ranking would be the same. Say you had two choices:
The ranking is unchanged by your choice of benchmark (buy price or sell price). In general:
Walter Whiteley 

