Please help.. Ive been stuck on this question for quite some time.

Kwun Company accumulates the following adjustment data at December 31. Services performed but unbilled totals $600. Store supplies of $160 are on hand. The supplies account shows a $1,900 balance. Utility expenses of $275 are unpaid. Services performed of $490 collected in advance. Salaries of $620 are unpaid. Prepaid insurance totaling $400 has expired. Instructions For each item, indicate the type of adjustment (prepaid expense, unearned revenue, accrued revenue, or accrued expense) and the status of the accounts before adjustment (overstated or understated)