actual number acheived,:Stacked Bar Chart

Hi Everyone,

Might be quite a simple solution I'm not sure.

Basically i need to create a chart with a target number against an actual, so the bottom of the stacked chart will be the actual number acheived, with the top of the chart being the remainder of the target

for example a target of 50 and having acheived 20

1 bar to a total of 50, with the bottom being 20 and the top being 30.

However i also require the figures to be updated, so when i change the cell of the actual to be 25 the graph will update with 25 at the bottom at 25 at the top.

Theres something called a 100% stacked column chart, but i cant seem to get to grips with it!!

Any help is greatly appreciated!!

Thank you for your time!