The formula S = A models the value of a retirement account, where A = the number of dollars added to the retirement account each year, r = the annual interest rate, and S = the value of the retirement account after t years. If the interest rate is 11%, how much will the account be worth after 15 years if $2200 is added each year? Round to the nearest whole number.
A. $86,218
B. $168,418
C. $11,675
D. $35,200

Question

The formula S = A models the value of a retirement account, where A = the number of dollars added to the retirement account each year, r = the annual interest rate, and S = the value of the retirement account after t years. If the interest rate is 11%, how much will the account be worth after 15 years if $2200 is added each year? Round to the nearest whole number.
  A. $86,218 	
  B. $168,418 	
  C. $11,675 	
  D. $35,200

anonymous · Answer

[(1+9)^t+1 -1/r]
The r is under all of it

anonymous · Answer

That equation goes after the S=A

anonymous · Answer

It is 8621