Answer: 
$57,600 
Explanation: 
The computation of the increase in Piper's deferred income tax liability for this temporary difference is shown below:- 
Purchase of voting Common stock of Betz inc. by Piper Corp.= ( Betz's reported earnings - Betz Paid Dividends ) × (Percentage of the voting Common stock of Betz inc.) 
= ($720,000 - $240,000) × 40% 
= $480,000 × 40% 
= $192,000 
Now, the rise in Piper's deferred income tax liability for this temporary difference is 
Purchase of voting Common stock of Betz inc. by Piper Corp. × enacted tax rate 
= $192,000 × 30% 
= $57,600