"should read revenue is 17 times the actual interest"
17 times cover does seem to be more than adequate to service the interest payments. We do need to take into account though its future economic growth which obviously will have an impact on its future revenue.
"in business they say 1.5 times earnings above interest is ok"
I think 1.5 times would be the bare minimum. Of course the interest cover ratio will depend on the risk profile of that business, if it is cyclical I would expect the cover to be higher than 1.5 times.
