A bullet 8.5cm long and 20mm in diameter is to be extruded in a direct extrusion operation with extrusion ratio of 3. the extradite has a round cross section. the die angle(half angle) =90 . the work metal has a strength coefficient =375MPa, and strain hardening exponent =0.17. use the Johnson formula with a=0.9 and b=1.4 to extrusion strain. the pressure applied to the end of the bullet as the ram moves forward will be?