Question: Letter Systems lnc, has a limited amount of direct material available for products 1A1 and 2B2. Each unit of 1A1 has a contributionmargin of $12 and each unit of 2B2 has a contribution margin of $30. A unit of 2B2 uses three times as much direct material as a unit of1A1. What is Letter's most proftable sales mix, assuming there is unlimited demand for either product? O Make al 2B2. O Make all 1A1. OMake equal number of units of 1A1 and 2B2 OMake three times as many 1A1 as 2B2.