4. A machinability rating is to be determined for a new work material. For the base material (B1112), test data resulted in a Taylor equation with parameters = 0.29 and C-490. For the new material, the Taylor parameters were n-0.23 and C-430. Units in both cases are: speed in m/min and tool life in min. These results were obtained using cemented carbide tooling. (a) Compute a machinability rating for the new material using cutting speed for a 30-min tool life as the basis of comparison.