Aztec furnishings makes gand crafted furniture for retail stores. The furmitre maker has recently installed a new assembly process , including a new sander and polisher . with this new system , production has increased to 90 pieces of furniture per day from the previous 60 pieces of furniture per day. The number of defective items produced has dropped from 10 pieces a dayto 1 per day. The production facility operates strictly eight hours per day. Evaluate the change in productivity for Aztec using the newly assembly process. ( if the change is decrease identify with a negative symbol(-).