Answer and Explanation:
The preparation of the differential analysis is presented below:
Particulars   Sell Rough cut   Process       Differential
           (Alternative 1)   Further into      Effect on income
                        Finished cut     (Alternative 2)
                      (Alternative 2)
Revenues
per 100 board feet   $540   $668        $128
Cost per $100
Board ft            -$402   -$523      -$121
Income
or loss
per 100 board       $138    $145        $7
In the case when the product would get process further so there is an increase in revenue by $7