There is a formula for these problems . . .
. . .
I'll do the third one for you.
For the others, we need to be told the number of years.
Find the amount of each ordinary annuity.
c. A payment of $2800 at the end of every 6 months for 5 years
with an interest rate of 9% per annum, compounded semi-annually.
We are given: .