please explain

You are to provide an assessment of potential energy production from a local farm which is considering an anaerobic digester to treat its wastes. The farm has 150 cattle, 202 pigs, and 753 hens. Assuming 1m3 of biogas has 20 MJ energy value and would give 1.7kWh of electricity, estimate the annual energy value and electricity production from this farm using the information given below: How much money ( $/ year) can be saved by generating electricity from the captured biogas if the cost of purchased electricity is $0.095/kWh