Pitt Jones Company had the following activities, allocated costs, and allocation bases: Activities Allocated Costs Allocation Base Account inquiry (hours) $60,000 2,000 hours Account billing (lines) $30,000 20,000 lines Account verification (accounts) $15,000 20,000 accounts Correspondence (letters) $10,000 1,000 letters The above activities are carried out at two of their regional offices. Northeast Office Midwest Office Account inquiry (hours) 100 hours 200 hours Account billing (lines) 10,000 lines 7,000 lines Account verification (accounts) 1,000 accounts 600 accounts Correspondence (letters) 50 letters 100 letters. How much of the correspondence cost will be assigned to the Northwest office?