Answer and Explanation:
a. The Journal entry is shown below:-
1. Hedge charges Dr, $150  
      To Cash Account $150
(Being bank charges is recorded)
2. Hedge Instrument - Financial Asset	Dr, $600  
         To Profit and Loss A/c $600
(Being financial assets is recorded)
3. Profit and Loss A/c Dr, $600  
         To Inventory Account - Copper $600
(Being profit and loss account is recorded)
4. Bank A/c Dr, $22,400  
           To Sales $22,400
(Being bank account is recorded)
2. The computation of the gross margin and locked with the put option and actual reported gross margin is shown below:-
Particulars   Rate    Pounds   Amount   Gross Margin    Gross Margin
Cost Price   $2.15   10,000    $21,500
Strike Price   $2.3	10,000     $23,000      $1,500             6.98%
Cost after hedge
loss of           $0.6    2.09        10,000       $20,900
Selling Rate   $2.24 10,000    $22,400       $1,500         7.18%
Gross margin locked with the put option: 6.98%
Actual reported gross margin: 7.18%
The two amounts are different, since the carrying value of the inventory has changed and the same has been reduced. As a result the total gross margin of 1,500 yielded another percentage as the base value (inventory carrying value) was adjusted.