You buy 2,000 pens at the beginning of the school year. You estimate that 20% of them will have to be put on your "discount plate" at the end of the term on which everything is priced at $1. Generally, about 39% of the "discount plate" items will be damaged or broken and will have to be thrown away. The pens cost you $1.28 per pen and you want an average markup of 33% based on selling price