FSC % and New Wood %

I'd read that as Door A is comprised of 23% New-Wood (i.e. the portion applicable to MRc7) and that 98% of that New-Wood portion is then FSC Certified (i.e. the portion actually compliant with MRc7). Door B would then be 30% New-Wood of which 90% is FSC-certified. It might be easier to go back to thinking about that in terms of weights (since that's what those percentages refer to). Assuming Door A weighs 100 lbs, they're saying that 23 lbs of that is new-wood products (i.e. 23% of the whole). Of that 23 lbs, 98% is FSC-certified (i.e. about 22.5 lbs). That's the level of detail you really need for reporting on this credit for that product type as you have to pull out all of the non-new-wood components (of which doors usually contain recycled-wood cores that aren't applicable). There are two columns in the MRc7 section to address both of those percentages and it's great that the manufacturer sent you all that information up-front (usually I have to go back and request it).