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January 30, 2015

January 30, 2015

Posted by **lisa** on Monday, April 4, 2011 at 12:00pm.

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 feet will cost $150, etc. How much will it cost to build a 90-foot tower?

- math -
**Reiny**, Monday, April 4, 2011 at 12:37pmcost = 100 + 125 + 150 + 175 + for 9 terms

This is an arithmetic series

a = 100

d = 25

n = 9

Sum(9) = (9/2)(2(100) + (9-1)(25))

= (9/2)(200 + 200) = 1800

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