Question 1059646
I lifted this from another site:
A = P (1 + r/n) (nt)

Where:

A = the future value of the investment/loan, including interest
P = the principal investment amount (the initial deposit or loan amount)
r = the annual interest rate (decimal)
n = the number of times that interest is compounded per year
t = the number of years the money is invested or borrowed for
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For your problem:
{{{ A = 1200 }}}
{{{ P = 600 }}}
{{{ r = .08 }}}
{{{ n = 12 }}}
Solve for {{{ t }}}