A partial adjusted trial balance of Ivanhoe Company at Jan. 31 2020 SUPPLIES DEBIT-800 PREPAID INS. DEBIT-2400 SALARIES AND WAGES PAYABLE CREDIT-800 UNEARNED SERVICE REVENUE CREDIT-750 SUPPLIES EXPENSE DEBIT-800 INS. EXPENSE DEBIT-400 SALARIES AND WAGES DEBIT 2900 SERVICE REVENUE CREDIT--2300. IF THE AMOUNT IN SUPPLIES EXPENSE IS THE JAN. 31 ADJ. ENTRY AND 1200 OF SUPPLIES WAS PURCHASED IN JAN. WHAT WAS THE BALANCE IN SUPPLIES ON JAN 1? IF INS. EXPENSE IS JAN. 31 ADJ. ENTRY AND THE ORIGINAL INS. PREMIUM WAS FOR 1 YR, WHAT WAS THE TOTAL PREMIUM AND WHEN PURCHASED? IF 3800 OF SALARIES WAS PAID IN JAN WHAT WAS THE BALANCE IN SALARIES PAYABLE AT DEC. 31 2019