Answer:Please see explanation column for answer
Step-by-step explanation:
a)Journal entry for Crowe Co.
 Date Account title Debit C redit
July 1st Prepaid Insurance $15,000
 Cash $15,000
 Dec 31st Insurance expense $2,500
 Prepaid Insurance $2,500
Calculation:
 Insurance expense = Principal x period 
= 15,000 x 6/12(july to december) x 1/3 ( one year from the 3 year insurance )
 = $2,500
b)Journal entry for Zubin Insurance Co
 Date Account title Debit Credit
July 1st Cash $15,000
 Unearned service revenue $15,000
 Dec 31st Unearned service revenue $2,500
 Service revenue $2,500
Calculation:
 Unearned service revenue = Principal x period 
= 15,000 x 6/12(july to december) x 1/3 ( one year from the 3 year insurance )
 = $2,500