Vn = V0(1+i)n
Vn = Value of cash flow at time n, Vo = Value of cash flow
today, i = Interest Rate, n = t.
Above is the more accurate version of the formula, but you can also use this:
PV = FV x (1+i) ^ n
Where PV = present value, FV = future value, i = interest rate (as a decimal, 8.45% = 0.0845), n = the number of periods.