Two systems are interconnected by two 16 MW tie lines. System A has four 30 MW generating units with forced outage rates of 10%. System B has eight 15 MW generating units with forced outage rates of 8%. Calculate the expected loss of load in each system in days and in MW for a one-day period, given that the peak load in both System A and System B is 100MW, 

(a) if the tie lines are 100%reliable, 

(b) if the tie lines have failure rates of 5 failures/year and average repair times of 24 hours.