Question 923616
The formula is:
{{{ A = P*( 1 + r )^t }}}
for annually compounded interest loans 
{{{ t }}} is the years to pay off the loan
{{{ r }}} = the interest rate
{{{ P }}} = the principle of the loan
{{{ A }}} = what you end up paying

-------------------------------
Take $2,000 off the principle, so the loan starts with
{{{ 12000 - 2000 = 10000 }}}
{{{ P = 10000 }}}
------------------
There are {{{ 36 }}} in the {{{ 3 }}} years from the beginning of
2013 to the end of2015 
The amount paid to the bank in those {{{3}}} years is:
{{{ 36*349.92 = 12597.12 }}}
{{{ A = 12597.12 }}}
-------------------
{{{ 12597.12 = 10000*( 1 + r )^3 }}}
{{{ ( 1 + r )^3 = 1.259712 }}}
{{{ 3*log( 1 + r ) = log( 1.259712 ) }}}
{{{ 3*log( 1 + r ) = .1002713 }}}
{{{ log( 1 + r ) = .033424 }}}
{{{ 10^(.033424 ) = 1 + r }}}
{{{ 1 + r = 1.080001 }}}
{{{ r = .08 }}}
The compound interest rate is 8%
Check my math, calculator work, and maybe
get a 2nd opinion, too