Any help would be greatly appreciated! Thank you

The irreversible elementary gas phase reaction 2AB+C is currently carried out in a packed bed reactor containing 100kg of catalyst. The entering pressure is 20atm and the exit pressure is 4atm. Currently 50% conversion is achieved. It is proposed to add a CSTR with 200Kg of catalyst downstream of the PBR. There is no pressure drop in the CSTR. The flow rate and temperature remain unchanged. What would be the overall conversion in such an arrangement? Curr