Vaughn visuals produces tablets and books. total overhead costs traditionally have been allocated on the basis of direct labor hours. after implementing activity-based costing, managers determined the following cost pools and cost drivers. they also decided that general costs should no longer be allocated to products. activity pool department costs cost driver binding $255,816 number of units printing 831,402 machine hours product design 193,116 change orders general 619,894 none total overhead costs $1,900,228 other information is as follows: tablets books units 62,600 20,100 direct materials cost per unit $3.11 $10.44 direct labor cost per unit $4.17 $7.85 direct labor hours 25,300 16,500 machine hours 126,000 122,000 change orders 1,400 2,900 calculate predetermined oh rate. (round answer to 2 decimal places, e. g. 15.25.) predetermined oh rate $ /dlh