DAX query for calculating column

Hi all,

Apologies in advance if this has been answered before.

But I want to create a powerbi which shows three different line charts:

1; line chart with turnover

2; line chart with costs

3; line chart with result (turnover minus the costs)

to create those line charts I have three different coloms in my table:

1; column which tells you ''sales'' and ''costs''

2; column with the figures (postive and negative) (Result)

3; column with 0's and 1's telling you that 0=costs/1=sales (RowType)

So I already created the first two line charts by adding an filter on visual level. So the turnover line chart shows figures when RowType is 1 and the costs line chart is showing data when RowType is 0. But now I have to create the third line chart which shows the results, so turnover minus the costs. Problably I have to create an new measure or column for that, but I don't know how...

Could somebody explain me how to fix this? :)