how to calculate achievement when loss is budgeted and actual loss is more than that?

Question

actual loss is -3079 budgeted loss is -2990

Answer 1

3079-2990=89, so loss is 89 greater than budgeted.

Achievement is measured as a percentage. -89/-2990=0.03 approx=3%.

But this is a failure rather than a positive achievement, so -3% indicates a negative achievement (failure). That is, 3% below target (budgeted loss).