Answer:
Taxable income understated by $82,000
Explanation:
Computation:
Particular                           Amount
Incorrectly recorded purchase          $7,400
Add:  Ending inventory overstated       $16,300
                                  $23,700
Less: Opening inventory overstated     $31,700
Less: Purchase of inventory            $74,000
Taxable income understated          $82,000