Answer:
30.000
Step-by-step explanation:
Income before taxes $300,000 
 
Timing difference between books and Tax (A)  $100,000 
 
Permanent difference cannot be considered for calculation of Differed tax liability or Deferred tax asset $40,000 (B) is zero 
 
Total Timing deference (C=A+B) $100,000 
 
Tax rate enacted for future (D) 30% 
 
Differed tax liability (C*D) $30,000