Bob Zeller Company has the following balances in selected accounts on December 31, 2020.
Service Revenue .................$40,000
Insurance Expense ................2,400
Supplies Expense ...................2,450
All the accounts have normal balances. Bob Zeller Company debits prepayments to expense accounts when paid, and credits unearned revenues to revenue accounts when received. The following information below has been gathered at December 31, 2020.
1. Bob Zeller Company paid $2,400 for 12 months of insurance coverage on June 1, 2020.
2. On December 1, 2020, Bob Zeller Company collected $40,000 for consulting services to be performed from December 1, 2020, through March 31, 2021.
3. A count of supplies on December 31, 2020, indicates that supplies of $600 are on hand.

Instructions
Prepare the adjusting entries needed at December 31, 2020.