On January 1, 2005 [before the adoption of ASC 718], Net Optimizers Inc. granted 1,000 nonqualified stock options (NQOs) valued at $.05 per option. Each option entitles the owner to purchase one share of stock for $1. These options vest at 10 percent per year for ten years. On December 31, 2015, 300 options are exercised when the stock price is $5. In 2015, what is the book-tax difference associated with the stock options? Is it favorable or unfavorable? Is it permanent or temporary?