[RikaStrom]

This is what happens when teachers' colleges teach pedagogy and don't teach the fundamentals.

Truth!

Unfortunately, with the way single-line expressions are parsed, you do indeed need those parentheses if you want the answer to be 2.

Yeah, I know, and it's killing me, because I was actually taught to assume those extra parenthesis (see post 600). Visual aides were the only thing to get me through math. I mean, I still use:

is over of = % over 100

to figure out tips and things like that.
I suck at math.

[SoothingDave]

Just move the decimal point over one for 10%. Double that to tip 20%, estimate between the two for rates inbetween. ;-)