Peter Company accumulates the below adjustment data at December 31. Indicate (a) the type of adjustment (prepaid expense, accrued revenues and so on), and (b) the status of accounts before adjustment (overstated or understated).
1. Supplies of $100 are on hand.
2. Services provided but not recorded total $900.
3. Interest of $200 has accumulated on a note payable.
4. Rent collected in advance totaling $800 has been earned.