Some of our clients' sustainable purchases (like ongoing consumables, for instance) do not have a simple payback or annual savings. Is it okay to include these items and mark the annual savings as $0.00? Or are sustainable purchases like ongoing consumables not intended for this credit. Similarly for sustainable purchases of durable goods, are we supposed to come up with an average of kWh saved by purchasing an EPEAT laptop over a regular one and how do we aggregate that same data with purchases like electric equipment for site/landscaping maintenance?