I need to distribute correctly a little data in an excel graph.

I have the total I've earned last year which should represent the 100% of the cake.

Then I have my insurance expenses and I want to understand, graphically, how much of my total income went away to pay insurance...

I know that a basic proportion like:

total expenses : total insurance costs = 100 : x

do the correct math but I can't find a way to display this in a cake graph...

Any hints?