The formula for finding present value of an ordinary annuity is:
[tex]PV=P*[\frac{1-(1+i)^{-n}}{i}][/tex], where P - money to be deposited, i - interest rate, n - number of payments.
So in this case, P = 35000, i = 6 / 100 = 0.06, n = 20.
Now, we have everything needed to determine how much money must be deposited:
[tex]PV=35000*[\frac{1-(1+0.06)^{-20}}{0.06}]=401447.24[/tex]
So the answer is $401,447.24.