Engineering Economy, Other Engineering

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I need the answers of these three problems.
1. How much money would be in a savings count that started with a deposit of $2,000 in year 1 with each succeeding amount increasing by 10% per year? Use an interest rate of 15% per year and a 7-year period.

2. You are a college student making yearly payment for your loan starting from now. For the first three years, you pay $2,500 a year. Year 4 to 6, your parents help you with the payment so you pay $1,500 per year, and finally year 7 you pay $2,500. Determine the value in year 8 that is equivalent to the cash flow stated above. Use an interest rate of 12%.

3. Calculate the present worth in year 0 of the following series of disbursements. Assume that i= 10% per year.
Year Disbursements, $ Disbursements, $
0 0 6 5,000
1 3,500 7 5,000
2 3,500 8 5,000
3 3,500 9 5,000
4 5,000 10 5,000
5 5,000


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