Answer:
Dominican Sugar Company
1. Differential Analysis as of March 24:
                                           Raw Sugar       Refined Sugar
                                         Alternative 1       Alternative 2       Difference
Sales volume                        42,000            33,600
Selling price per pound          $1.40              $2.20
Sales revenue                   $58,800          $73,920                 $15,120
Materials requirement      100,000            42,000
Output from process         42,000            33,600
Unit cost                               $0.35              
Cost of materials            $35,000          $35,000
Cost of further refining                           $21,000
Total costs                      $35,000          $56,000                ($21,000)
Net income                     $23,800           $17,920                  ($5,880)
2. Based on cost implications, Dominican Sugar should not refine the raw sugar further.  Further refining will cause the company $5,880 in lost income.  This means that it costs more to refine the raw sugar.
Explanation:
a) Data and Calculations:
                                           Raw Sugar       Refined Sugar
                                         Alternative 1       Alternative 2
Sales volume                        42,000            33,600 (42,000/1.25)
Selling price per pound          $1.40              $2.20
Sales revenue                   $58,800          $73,920
Materials requirement      100,000            42,000
Output from process         42,000            33,600 (42,000/1.25)
Unit cost                               $0.35              
Cost of materials            $35,000          $35,000
Cost of further refining                           $21,000 (42,000 * $0.50)
Total costs                      $35,000          $56,000 
Net income                     $23,800           $17,920