URGENT! how to create a chart? Nothing is clear to me!

CHART

I’m creating a PIE chart.

it has two colors(parts)
one is sum of number a,b,c .
and the other is 500- (a+b+c)

how can I create it?
what is value expression and label expression?

I would appreciate a lot if you can teach me…!

THanks,

It’s not solved… with free plugin, how do we use it??

Try this out.

thanks but how about with free chart plugin??

Read this:

You need to use “group by”