Sometimes I think you just like to mix it up for the fun of it!
is easier to write X*Y/100 than to write X*Y and then go to the Formatting to use the % presentation. . .takes much longer and of you want to change the number-type for the column then you have to change it back again.
Huh? What's so hard about clicking on the column header, nd formatting it to %? Or back again.
BTW: If you have a cell formatted to %, and you enter 15, it converts it to 0.15.