value of stock?

Question

the value of a stock is given by the function V(t) = 20 + 58(1-e^-i.i t) where V is the value of the stock after time t, in months. How do I find the value of the stock after two months?

Answer 1

I don´t understand the exponent but if it is a*t
V(2) = 20+58(1-e^-2a) where a should be i.i