Yeah. I suck at arithmetic. For the soda example, I just round down to 3 and say: "about $1". Much faster than worrying about 5 cents. But I also know how to s

Yeah. I suck at arithmetic. For the soda example, I just round down to 3 and say: "about $1". Much faster than worrying about 5 cents. But I also know how to solve for discount percentages, where most people would not, the article states.