HP 12c Platinum Error 0 in Percent Difference

[Kaijikunito]

The more I use RPN the more cumbersome ALG mode seems. I am pretty new to using calculators in general though, outside of high school math classes some decade ago.

For example, yesterday I was trying calculate what the likelihood was of a response in chess relative to the total responses. First I summed the number of times all responses were used to find the total, and for the life of me I couldn't figure out how to then divide the number of times a particular response occurred by the total. It wasn't until today that I remembered that I can actually store numbers... >.<!