The damages cost if a five-year flood occur in a residential area was estimated at RM100 million. A dam which costs RM 250 million is to be constructed to protect the area up to 200 years flood. If the interest rate is 5% and the dam life span is 100 years, estimate the annual benefit of constructing the dam from the five-year flood. The annual operation and maintenance cost is RM 800 thousand per year