A pharmaceutical company has a CSTR fermentation process (A + B -> 2B;r = KCACB) that occurs in an open tank in which the liquid is kept at constant height. The tank has a volume of 1000 L. One night, a bear fell into the tank, but the system adjusted itself such that the tank volume is maintained at 1000 L. Next day, the data log shows that the conversion from the process decreased from its normal 75% to 72%, but the flow rate did not change. What is the weight of the bear? Assume the density of a typical bear is 1 kg/L. Note: You may assume that CBo = 0