Flannery​ Company, a manufacturer of small​ appliances, had the following​ activities, allocated​ costs, and allocation​ bases: Activities Allocated Costs Allocation Base Account inquiry​ (hours) $ 77 comma 000 2 comma 600 hours Account billing​ (lines) $ 38 comma 000 19 comma 000 lines Account verification​ (accounts) $ 20 comma 000 30 comma 000 accounts Correspondence​ (letters) $ 14 comma 000 1 comma 600 letters The above activities are carried out at two of its regional offices. Activities Northeast Office Midwest Office Account inquiry​ (hours) 100 hours 200 hours Account billing​ (lines) 10 comma 000 lines 9 comma 000 lines Account verification​ (accounts) 1 comma 000 accounts 650 accounts Correspondence​ (letters) 50 letters 110 letters What is the cost per letter for the correspondence​ activity? (Round your answer to the nearest​ cent.)