math update

Lest you all start thinking that my math skills have frozen with my toes, I'll acknowledge that my calculations about the value of the togrog was an inadvertant shortcut. One togrog is not worth $1.46; 1000 togrog is worth $1.46, but I had done my trick of cutting off the 3 right-hand digits in my mental calculations and forgot to put them back on in my discussion of prices and shopping.