2-21 Last year to help with your New Year's resolutions you purchased a $500 piece of fitness equipment. However, you use it only once a week on average. It is December, and you can sell the equipment for $200 (to someone with a New Year's resolution) and rely on the university gym until you graduate in May. If you don't sell until May, you will get only $100. If you keep the heavy piece, you'll have to pay $25 to move it to the city of your new job (where you interned last summer). There is no convenient?