Answer and Explanation:
1. The computation of overhead rate based on direct labor cost is shown below:-
Overhead rate = Overhead applied × 100 ÷ Direct labor cost
= 888 × 100 ÷ 1,200
= 74%
2. The Preparation of job-order cost sheet for the four jobs is shown below:
Particulars                Job 86        Job 87        Job 88        Job 89
Beginning balance $6,888       $6,820
Direct materials       $3,000      $7,000         $2,100          $1,500
Direct labor              $800          $6,000        $900            $500
Applied overhead   
is 74% of direct labor $592           $4,440       $666            $370
Total                          $11,280       $24,260      $3,666      $2,370
3. The computation of ending balances of Work in Process and Finished Goods is shown below:-
Work in process of Job 88 = $3,666
Finished goods = Total of Job 86 + Total of Job 89
= $11,280 + $2,370
= $13,650
4. The computation of the Cost of Goods Sold for March is shown below:-
Cost of goods sold is 
= Job 87
= $24,260