Following is a list of account balances of Wilson Mowing Service as of December 31 of the first year of operation: Accounts receivable $2,500 Accounts payable 3,500 Salary expense 4,500 Repairs expense 800 Truck 8,500 Equipment 6,300 Notes payable 8,200 Cash 6,800 1,600 Supplies expense 31,900 Service revenue 3,800 Gasoline expense 200 Salary payable Calculate the net income. Select one: O a. $11,900 O b. $24,100 O c. $12,200 d. $21,200