Determining interest charged and amount due


Assignment:

Q1. Dan borrows $500 at 9% per annum simple interest for 1 year and 2 months.  What is the interest charged, and what is the amount due?
 
Q2. A mutual fund pays 9% per annum compounded monthly.  How much should I invest now so that 2 years from now I will have $100 in the account?
 
Q3. Hal deposited $100 a month in an account paying 9% per annum compounded monthly for 25 years.  What is the largest amount he may withdraw monthly for 35 years?

Note:

For Question #3, the annuity continues to earn 9% monthly compounded interest for the 25 years of initial deposits and the 35 years of withdrawals.  This is basically a 2-step problem.
 
1.)  Find the total amount Hal has after depositing $100 per month in the annuity at 9% compounded monthly for 25 years.
2.)  Use the amount from part 1 and find how much he can withdraw monthly for 35 years while it continues to earn 9% compounded monthly.

Q4. If an amount was borrowed 5 years ago at 6% compounded quarterly, and $6000 is owed now, what was the original amount borrowed?
 
Q5. $6000 is borrowed at 10% compounded semiannually.  The amount is to be paid back in 5 years.  If a sinking fund is established to repay the loan and interest in 5 years, and the fund earns 8% compounded quarterly, how much will have to be paid into the fund every 3 months?
 
Q6. How much principal is needed to get $800 in 2 years at 5% compounded monthly?
 
Q7. If Jack sold a stock for $35,281.50 that cost him $22,485.75 three years ago, what annual compound rate of return did Jack make on his investment?
 
Q8. The  grand prize in an Illinois lottery is $6,000,000, which will be paid out  in 20 equal annual payments of $300,000 each.  Assume, the first payment of $300,000 is made, leaving the state with the obligation to pay out $5,700,000 in 19 yearly equal payments of $300,000 each.  How much does the state need to deposit  in an account paying 6% compounded annually to achieve this?
 
Q9. A mortgage of $125,000 is to be amoritized at 9% per annum for 25 years.  What are the monthly payments?  What is the equity after 10 years?

Q10. A couple wants to save for their child's college education.  If they deposit $500 every 6 months at 6% compounded semiannually, how much will they have on hand at the end of 8 years?

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Mathematics: Determining interest charged and amount due
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