posted by ernest .
need a reinstatement A person hired a firm to build a CB radio tower. The firm charges $100 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; the next 10 fee will cost $150, etc. How much will it cost to build 90-foot tower?