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Part 1: Single-payments The formula that governs single amounts of money is F =P(1+i)n (1) where F is future value P is present value i

Part 1: Single-payments

The formula that governs single amounts of money is F =P(1+i)n (1)

where

F is future value P is present value i is the interest rate per period n is the number per periods

1-Suppose you have $100 today; how much will you have in 10 years, if your savings account pays 1% interest per annum? Note, 1% is the same as i = 0.01.

2-Suppose you want to save for a $100 purchase 10 years in the future. How much do you need to put in your bank account today, if it pays 1% interest per year?

3-Suppose you have $100 today; how much did you have to deposit in your savings account 10 years ago, if it pays 1% interest per annum? (Hint: This should be a short/easy/repet- itive question.)

Notice that the words present and future dont actually mean present and future, but that they indicate which values come first. In this question, todays value is F , and the value 10 years ago is P .

Part 1.1: Interest compounding period not a year

In most real-life cases, interest rates are cited annually, but compounded at periods less than a year. In this case, we need to revise our interest rate i to match the equivalent compounding period, and set our number of periods n to the equivalent number of compounding periods.

4-Suppose we are considering a 5-year investment that is compounded semi-annually (i.e. twice a year). What is the appropriate n?

5-Suppose our investment pays 2% per annum, compounded semi-annually. What is the appropriate i?

6-Compute the final value of our 5-year investment at 2% per annum compounded semi- annually, if we invest $100 today.

7-Suppose 7 years ago, we borrowed $1200 in at 1% per annum, compounded quarterly (i.e. 4 times a year). How much do we owe today?

8-How much would we owe if our loan had compounded monthly? This difference is the extra interest we have to pay.

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