Answer:
(a) 153.37 g
(b) 5705 kJ
Step-by-step explanation:
(a) To find the amount of bean needed by a man you first calculate the equivalence in beans to 2500kJ

Thus, 153.37 g has the energy needed by a man that needs 200kJ per day.
(b) The amount of energy per pot of bean is given by:

Thus, the energy is 5705kJ