A company has improved its production process. Under the old process, 16 workers could produce 4,892 units per hours and the materials cost $53 per unit of output. Workers are paid $15 per hour and the finished product is sold for $112 per unit. After the improvement, materials costs have been reduced by $13 per unit of output and it now takes 2 fewer workers to make the same amount of output. What is the percentage change in multifactor productivity? (do not use a % sign, e. g. enter 50% as .5)