1 cup of coffee $ 1.80
One week $ 9.00
One month $ 36.00
One year $ 432.00

Let's assume for a moment that you buy a cup of coffee every morning before work. You're not a morning person, so you go for the large, which costs $1.80. Some easy multiplication shows us that's $9 a week. Not bad, you may think to yourself, you can afford that. Taking our calculations a few steps further, however, gives us a more complete idea of how much your morning coffee is costing, specifically, $36 a month, or even worse, $432 a year! Over four hundred dollars for coffee? Suddenly those $1.80 purchases seem a bit more meaningful.