In an aqueous solution, reaction P→Q occurs under isothermal conditions following first order kinetics. The feed rate is 500 cm³/min and concentration of P in the feed is 1.5×10^-4mol/cm³. The reaction is carried out in a 5 litre CSTR. At steady state, 60% conversion is observed. The 5 litre CSTR is replaced by five CSTRs in series. If the capacity of each new CSTR is 1 litre, then the overall conversion (in %) is