A company has improved its production process. Under the old process, $16$ workers could produce $4,492$ units per hours and the materials cost $$60$ per unit of output. Workers are paid $$14$ per hour and the finished product is sold for $$108$ per unit.

After the improvement, materials costs have been reduced by $$12$ per unit of output and it now takes $3$ 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 $\mathrm{.}5)$