Final answer:
The compensation expense Weiser should record for 2009 is $80,000. This is the last portion of the total $240,000 compensation expense recognized over the three-year vesting period as determined by the Black-Scholes model.
Step-by-step explanation:
The amount of compensation expense Weiser should record for 2009 under the fair value method is $80,000. Since the total compensation expense over the vesting period determined by the Black-Scholes option pricing model is $240,000 and the options vest evenly over a three-year period from January 1, 2007, to January 1, 2010, Weiser should recognize $80,000 each year ($240,000 total expense / 3 years).
In 2009, as it is the third year of the vesting period, Weiser would record the final third of the expense. If all options are exercised on January 1, 2010, it confirms that the conditions for the expense recognition over the service period were met, but as it is after the 2009 accounting period, it does not impact the 2009 compensation expense.