Divide value minus

Hello Community!

I have a task to calculate profit of two different types of sellary, and percentage, which every type consist from total amount of profit.

The problem is that in some cases we have loss in profit and as a result we have negative balance in total.

When we try to calculate percentage, as a result we divide positive profit and negative total, that is why we get negative percentage.

In our desired result we must see that in case where profit in one type of sellary is positive, then the percentage must also be positive. 

Please help me to write a mesure which will complete my task

Example table