When manufacturing overhead is underapplied, we close it by debiting (adding) it to cost of goods sold, yet, in Exhibit 4.15, when estimating the cost of goods manufactured, under applied overhead is subtracted, not added. Explain why.
Exhibit 4.15

Direct material: $30 000 Raw material inventory, 1 November 252 000 Add November purchases of raw material Raw material available for use 282 000 _51 000 Deduct Raw material inventory, 30 November Raw material used 231 000 Direct labour 90 200 Manufacturing overhead: Indirect material $500 Indirect labour 14 000 Rent on factory building 22 000 Depreciation on factory equipment 35 000 Electricity 4 000 Council rates 2 000 Insurance 5 000 Total actual manufacturing overhead 82 500 Deduct Underapplied overhead 500 Overhead applied to work in process 82 000' Total manufacturing costs 403 200 Add Work in process inventory, 1 November 151 200 Manufacturing costs to account for 554 400 Deduct Work in process inventory, 30 November 364 000 Cost of goods manufactured $190 400