Grab a calculator and you'll discover that, over 40 years going out to dinner twice a month at $40 each time amounts to half a million.
拿起计算器，你会发现，40多年来，每月两次外出吃晚餐，每次花费40美元，总计50万美元。
2
Use an online calculator to do a "time value of money" calculation that shows him how much debt you can run up when you're using a credit card that charges 17% interest.