Answer:
B/E ratio 1.2356
Step-by-step explanation:

300,000 - 43,000 = 257,000
257,000/0.04 = 6,425,000
initial cost 2,200,000
unkeep cost 120,000/0.04 = 3,000,000
6,425,000/(2,200,000+3,000,000) = 1.235576923
Note we are given a discount rate, which means the upkeep, benefits and disbenefits are perpetual.