The Swope Zoo operates a drive through tourist attraction. The company adjusts its accounts at the end of each month. The selected accounts appearing below reflect balances after adjusting entries were prepared on April 30. Fencing $ 42,000 Accumulated Depreciation S 6,300 Prepaid Rent $ 18,000 The fencing is being depreciated at $8400 per year. How many months has the company been depreciating the fencing