math
posted by amanda on .
what do i have to do to solve this?
Khety must save $5050 for a down payment on a car. He currently has $1925 in an account yielding 6.5% simple interest. If he saves no additional money, how long until he has enough for the down payment?

Future value = Present value (1 + interest rate)^n, where n = number of years.
5050 = 1925(1.065)^n
Rearranged n= (log 5050  log 1925)/log (1.065) 
a couple invests $4500 in an account paying 7% compounded quarterly. how much is in the account after one year?

a sequence of yearly payments of $6000 is invested at an interest rate of 4.5%, compounded annually. what is the total amount of the annuity after 12 years?