Cost benefit ratio

[distantobserver]

I hope this is the correct link?

On line 456 the formula is incorrect

/ $this->interventions[$i]['items'][$a]['cost_of_problem_unscaled'];

it should be cost of intervention not cost of problem.

similarly line 458 should be changed in the same way

/ $this->interventions[$i]['items'][$a]['cost_of_problem_scaled']