4. Selected accounts for Bignet Company are presented below before making closing entries on March 31.

Service Revenue, CNY38,500 Salaries Expense, CNY8,800 Supplies Expense, CNY1,600

Retained Earnings, CNY16,000 Rent Expense, CNY3,000 Dividends, CNY3,500

Advertising Expense, CNY1,000 Depreciation Expense, CNY1,500

Requirement:

Prepare the closing entries on March 31, and calculate operating income for the month of March.