Sure looks like there are some government bean counters on this forum, taking what is obviously a simple matter and adding complications to it for the pure joy of being number crunchers.
The ONLY thing that you could multiply by 87 is the price, as that is strictly apples to apples. Weight and height have no bearing here at all. Now I know why engineers-and I don’t mean the kind that drive trains- and accountants are about one step from lawyers!