Libri Industries (LI) assembles two models of eBook readers for a retail chain: Cranny LX and Cranny DX. Profit contributions are $70 and $80 for each unit of Cranny LX and Cranny DX, respectively. For the next month, LI has already agreed to fill customer orders for 100 units of each model. At the same time, LI's sales and marketing group project that it may not be possible to sell more than 300 units of LX and more than 280 units of DX model in the next month. One unit of Cranny LX takes 20 hours to assemble, while one unit of Cranny DX requires 25 hours of assembly time. In the month, LI has 11,000 hours of assembly time available. Formulate a linear model to determine the number of units of each eBook model to assemble in the next month to maximize LI's profit by using the following decision variables: L = number of units of Cranny LX to assemble in the next month D = number of units of Cranny DX to assemble in the next month Assume that these variables can take fractional values