In a surface grinding operation performed on hardened plain carbon steel, the grinding wheel has a diameter of 250 mm and width of 25 mm. The wheel rotates at 2800 rpm, with a depth of cut (infeed) of 0.05 mm/pass and a crossfeed of 4.0 mm. The reciprocating speed of the work is 6 m/min, and the operation is performed dry. Determine the number of chips formed per unit time in million of chips/min to three decimal place if there are 64 active grits/cm of wheel surface.