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Calculate the combined predetermined OH rate using (1) units of product and (2) machine hours. Assume that all actual overhead costs are equal to expected overhead costs in 2010, but that Lansing Mfg. produced 11,000 units of product. If the separate rates based on units of product calculated in part (a) were used to apply overhead, what amounts of underapplied or overapplied variable and fixed overhead exist at year-end 2010?