Melbourne Company estimated that machine hous for the year would be 40,800 hours and overhead (an fixed) would be 5167280 Meibourne applies its overhead on the basis of machine-hours. During the yeat, all ovethead costs were exactly as planned (\$167.280) There was $17,220 in overapplled overhead. Required: How many machine hours were worked duing the period? (Do not round intermediate calculations.)