The income statement of Dolan Corporation for 2017 included the following items: Interest revenue $141,000 Salaries and wages expense 210,000 Insurance expense 21,200 The following balances have been excerpted from Dolan Corporation's balance sheets: December 31, 2017 December 31, 2016 Interest receivable $18,200 $15,000 Salaries and wages payable 17,800 8,400 Prepaid insurance 2,200 3,000 The cash paid for insurance premiums during 2017 was