A compound die blanks and punches a washer from aluminium-alloy sheet 3.2 mm thick: outside diameter 25.0 mm, inside diameter 12.0 mm, clearance allowance 0.060, tensile strength 350 MPa. Taking cutting force F = 0.7(TS) t L, determine (a) the punch diameter for blanking in mm, (b) the die diameter for punching in mm, (c) the press force in kN if blanking and punching occur simultaneously and (d) the press force in kN if the punches are staggered.