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.  Stix Furniture Company

Yesterday, the employees at Stix produced 46 chairs.  Of the 46 chairs produced, 12 were damaged due to a problem with a new sanding machine.  The damaged chairs can be discounted and sold for $25 each.  The undamaged chairs are sold to a retail chain for $70 each.  Labor costs were $720, material costs were $460, and overhead costs were $500.  What was the multi-factor productivity?