Brief Exercise 3-7 Determining Under- and Overapplied Overhead (LO7 - CC14) Osborn Manufacturing uses a predetermined overhead rate of $28.20 per direct labour-hour. This predetermined rate was based on 12,000 estimated direct labour-hours and $338,400 of estimated total manufacturing overhead. The company incurred actual total manufacturing overhead costs of $315,000 and 11,500 total direct labour-hours during the period. Required: 1. Determine the amount of underapplied or overapplied manufacturing overhead for the period