I'm trying to solve this mastery problem. I did the equations to calculate the cost per month for the office equipment and computer. If I calculated correctly, the office equipment cost $150/mo, and the computer cost $167/mo. Did I calculate those correctly? If so, I then plug the monthly costs into the appropriate Dr column and the appropriate Cr column, correct?

punting for a Service Business Kristi Williams Family Counseling Services Trial Balance December 31, 20 - - ACCOUNT DEBIT BALANCE CREDIT BALANCE ACCOUNT TITLE NO . 00 101 8 7 3 0 Cash 00 142 7 0 0 Office Supplies 145 6 0 0 00 Prepaid Insurance 181 18 0 0 0 00 Office Equipment 187 6 0 0 0 00 Computer Equipment 8 0 0 0 Notes Payable 201 Accounts Payable 202 5 0 0 Kristi Williams, Capital 311 11 4 0 0 Kristi Williams, Drawing 312 3 0 0 0 00 Client Fees 401 35 8 0 0 Wages Expense 511 9 5 0 0 00 Rent Expense 521 6 0 0 0 00 Utilities Expense 533 2 1 7 0 00 Miscellaneous Expense 549 1 0 0 0 00 55 7 0 0 00 55 7 0 0 Information for year-end adjustments is as follows: (a) Office supplies on hand at year-end amounted to $100. (b) On January 1, 20--, Williams purchased office equipment that cost $18,000. It has an expected useful life of 10 years and no salvage value. (c) On July 1, 20--, Williams purchased computer equipment costing $6,000. It has an expected useful life of three years and no salvage value. Assume tha Williams computes depreciation to the nearest full month. Willi