Indicate (a) the type of adjustment (prepaid expense, unearned revenue, accrued revenue, or accrued expense), and (b) the accounts before adjustment (overstated or understated) for each of the following: 1. Supplies of $200 have been used. 2. Salaries of $600 are unpaid. 3. Rent received in advance totaling $300 has been earned. 4. Services provided but not recorded total $500