Percentages - Calculate Original Value

I have two issues:

1, How do I calculate the original value of something if it has dropped say 9.3%
Ex Stock value 5.56 down 7.4%. How do I calculate its original value.

2, I have copied some numerical data from a website, on one computer when I drop that data into an excel sheet it falls into separate cells allowing me to manipulate it, on another computer I drop it into an excel spreadsheet and all the data goes into one cell not allowing me to manipulate it.

I was wondering is there a setting on one excel spreadsheet that I am inadvertantly not using on the other.