How much does it cost to build and operate a school system that makes attendance mandetory for all kids?
How much does it cost to staff a first class police department and build and operate a jail and municipal court?
How much does it cost to build a one mile long road north of the bridge?
How much does it cost to maintain the sanitation water, power and port systems?
How much does it cost to staff a fully operational taxing authority for a city?
Just do the arithmetic and subtract the current city income. Needs-Current income=Tax increase.

Please not that I did not include and funding or facilities for health care. If you want to know why just ask. The Ugly American Tourist

I'll be happy to discuss my avatar with anyone who knows what it is.