Calculating in one's head. How hard is it to work out if you are buying one item for $12 and another for $8, it's going to cost you $22?

... doffing one's hat or cap


On a lost course, I'm trying to revert this -- showing one's face when people greet you. Every evening I drive out of the office's underground car park with the driver's window fully lowered and the interior light turn on, while biding farewell to the saluting security guard. Most people speed by while the guard salutes the tinted windows.