Story problems

XpatienceX

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Nov 30, 2011
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1) 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 that 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?








2) A person deposited $500 in a savings account that pays 5% annual interest that is compounded yearly. At the end of 10 years, how much money will be in the savings account?
 
1) 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 that 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?

I moved your thread from the arithmetic board; these seem to be intermediate-algebra exercises.

Are you supposed to use formulas for an arithmetic sequence and sum of elements, in exercise 1?

If so, where are you stuck?

Otherwise, there are only nine numbers to add; you could just list them on paper and then use a calculator.



2) A person deposited $500 in a savings account that pays 5% annual interest that is compounded yearly. At the end of 10 years, how much money will be in the savings account?

Again, there is a famous formula for compound interest.

Do you need help understanding the symbols?

If so, show us what you've learned.

Otherwise, just substitute the given values for the appropriate symbols in the formula, and then do the arithmetic.

Are you taking a math class?
 
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