Answer:
1. Jul-01 
Dr Investment in JBI Corp $ 600,000 
Cr Cash $ 600,000
2. Nov-01
Dr Cash $ 5,000 
Cr Investment in JBI Corp $ 5,000
 
3. Dec-31
Dr Investment in JBI Corp $ 100,000 
Cr Investment revenue $ 100,000
Step-by-step explanation:
1. Preparation of Rowan's entries to record the purchase of JBI shares
Jul-01 
Dr Investment in JBI Corp $ 600,000 
Cr Cash $ 600,000
[To record investment in common shares of JBI Corporation] 
2. Preparation of Rowan's entries to record the receipt of its share of JBI dividends 
Nov-01 
Dr Cash [12,500*40%] $ 5,000 
Cr Investment in JBI Corp $ 5,000
[To record receipt of dividends] 
3. Preparation of Rowan's entries to record the December 31 year-end adjustment for its share of JBI net income
Dec-31
Dr Investment in JBI Corp [$250,000*40%] $ 100,000 
Cr Investment revenue $ 100,000
[To record share of net income for the year]