A reversible Carnot engine works between the temperature of 1000 K and 300 K. Heat supplied to the engine by 1000 K reservoir is 250 kJ. Now the work obtained by this engine is supplied to the refrigerator which works between the temperature limits of 270 K and 300 K. The COP of the refrigerator is 50% of the COP of the reversible refrigerator then find out the heat rejected by the refrigerator (in kJ) at the reservoir which is at 300 K.