Answer:
1. Prepare the journal entry on January 31 to record the collection of cash and recognition of the first month’s revenue,
January 31
Dr Cash 24,800
Dr Bonus receivables 1,240
 Cr Service revenue 26,040
2. Assuming total cost savings exceed target, record the entry on June 30 for receipt of the bonus
June 30
Dr Cash 12,400
 Cr Service revenue 4,960
 Cr Bonus receivables 7,440
3. Assuming total cost savings fall short of target and record the entry on June 30 for payment of the penalty.
Dr Service revenue 19,840
 Cr Bonus receivables 7,440 
 Cr Cash 12,400
Step-by-step explanation:
service revenue:
- if target is achieved = ($24,800 x 6) + $12,400 = $161,200
 - If target is not achieved = ($24,800 x 6) - $12,400 = $136,400
 
monthly revenue = [($161,200 x 80%) + ($136,400 x 20%)] / 6 = $128,960 + $27,280) / 6 = $26,040
The difference between monthly payment and monthly revenue must be recorded as bonus receivables.