I'm just kidding. Not really sure what you're asking. Can you give us an example of what you're trying to calculate? I suggest creating a spreadsheet with all of your numbers. The process of creating the spreadsheet will help you understand how cash flows through your portfolio better than any numbers could.
Say a stock is at 7.74 and it goes up to 8.63. What is the percentage? [answer: 11.5%] Say a stock is at 16.54 and it goes down to 15.01. What is the percentage? [answer: 10.2%] I did those both on a calculator. Is there an easy/tricky way to make reasonable estimations in your head?
I think of increases in terms of intervals of 10% (when I’m doing it in my head) as it’s easier to guesstimate. For example 7.74 to 8.63 is approximately $.90 increase. A $.774 would be 10% so I know it’s approximately 10 - 12%. Simple and easy but not going to pin a needle on it by any means. Hope that helps.
That sounds good to me. With a little practice I should be able to get that down, and I'm going to work on it.