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# A person hired a firm to build a CB radio tower. The firm charges $100.00 for labor for the first 10 feet.

A person hired a firm to build a CB radio tower. The firm charges $100.00 for labor for the first 10 feet. After that, the cost of the labor for each succeeding 10 feet is $25 more than the preceding 10 feet. That is, the next 10 feet will cost $125.00, the next 10 feet will cost $150. ect. How much will it cost to build a 90-foot tower?