Earlier this week, went to local grocery to buy some sweet potatoes, which were on sale for $0.25 per pound. They come, 40# to the box, and I wanted 4 boxes (160#.) We like sweet potatoes, and these $0.25 per pound ones taste a lot better than the $1.19 per pound ones. Being as how they were in boxes, the local grocery store brain trust had to figure out how to price them and how much. Scale at register was too small to hold a box. After watching them try on cash register, and then on app on phone, I told them that the total price would be $40, plus 2% sales tax ($0.80.) You would think that they had just met Einstien, as I could actually figure the price without using a calculator, or an app on the phone. I'm not sure these kids could count to 21, unless they were naked in the shower. The local brain trust at work!