Osborn Manufacturing uses a predetermined overhcad 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. 2. Assuming that the entire amount of the underepplied or overapplied overhcad is closed out to cost of goods sold, what would be the effect of the underapplied or overapplied overhead on the company's gross margin for the period?