Exercise 4-8 Wang Company accumulates the following adjustment data at December 31. For each item, indicate the (1) type of adjustment (prepaid expense, unearned revenue, accrued revenue, or accrued expense) and (2) the status of the accounts before adjustment (overstated or understated). (Enter your answers in alphabetical order.) (1) (2) Type of Adjustment Accounts Before Adjustment (a) Services performed but unbilled totals $600. (b) Store supplies of $160 are on hand. The supplies account shows a $1,900 balance. (c) Utility expenses of $275 are unpaid. (d) Service performed of $490 collected in advance. (e) Salaries of $620 are unpaid. (f) Prepaid insurance totaling $400 has expired.