Show estimated benefit amounts in screening results

From #63:
> I think a higher priority would be benefit amounts, in particular for LOOP and Homestead since homeowners can only apply for one or the other so it's helpful to know what the savings would be per benefit. For example I did this for myself and figured out it's best to stick with the Homestead Exemption, which is $1000/yr less in taxes than if I applied for LOOP.