If I understand this correctly, the first ten feet is $100. This leaves 80 remaining feet to be built. If the initial part of your question is what the answer needs to be based upon, feet 11-20 will cost $125, 21-30 will cost $150, 31-40 will cost $175, 41-50 will...

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If I understand this correctly, the first ten feet is $100. This leaves 80 remaining feet to be built. If the initial part of your question is what the answer needs to be based upon, feet 11-20 will cost $125, 21-30 will cost $150, 31-40 will cost $175, 41-50 will cost $200, 51-60 will cost $225, 61-70 will cost $250, 71-80 will cost $275, and 81-90 will cost $300.

The entire tower will cost $1800. (This number is the sum of all of the different costs per 10 feet.)