SOLUTION: 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 th

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Question 607662: 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 feet will cost $150, etc. How much will it cost to build a 90-foot tower?
Answer by jerryguo41(197) About Me  (Show Source):
You can put this solution on YOUR website!
This equations can be signified as:
tn=100%2B25%28n-1%29
n=tens of feet
tn=cost to build that ten feet
ex. to build 10 feet plug in 1 for n
t1=100%2B25%281-1%29
t1=100
keep going
t2=100%2B25%282-1%29
t2=125
t3=100%2B25%283-1%29
t3=150
t4=100%2B25%284-1%29
t4=175
t5=100%2B25%285-1%29
t5=200
t6=100%2B25%286-1%29
t6=225
t7=100%2B25%287-1%29
t7=250
t8=100%2B25%288-1%29
t8=275
t9=100%2B25%289-1%29
t9=300
Then add all the tn's together
100%2B125%2B150%2B175%2B200%2B225%2B250%2B275%2B300=1800
Thus it will take $1800 to build the tower