Crane company adjusted trial balance january 31, 2020 debit credit supplies $900 prepaid insurance 1,800 salaries and wages payable $ 700unearned service revenue 750 supplies expense 900 insurance expense 300 salaries and wages expense 2,600service revenue 3,400 if the amount in supplies expense is the january 31 adjusting entry, and $3,400 of supplies was purchased in january, what was the balance in supplies on january 1?