need help! intro to accounting

1. determine present value of $15,000 to be paid anually for 10 years. discounted at annual rate of 6%. payments occur end of each year.

2. determine present value of $9200 to be received today. assuming the money will be invested in a 2 year deposit earning 8% anually.

3.determine present value of $300 paid monthly for 36 months. with additional payment of $12,000 at the end of 36 month. discounted at monthly interest rate of 1.5%. the first payment is to be one month from today.

4. determine present value of $25,000 to be received annually for first three years followed by $15,000 to be received anually for the following two years. discounted at annual rate of 8%. assume collections occur at year end.