Question 1046572
The formula to use is:
{{{ A = P*( 1 + r*t ) }}}
{{{ A }}} is the amount he ended up with
{{{ r }}} is the interest rate 
{{{ t }}} is time in years
{{{ P }}} is the initial investment
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{{{ A = 1272.5 }}}
{{{ r = .018 }}}
{{{ t = 1 }}}
{{{ 1272.5 = P*( 1 + .018*1 ) }}}
{{{ 1272.5 = 1.018P }}}
{{{ P = 1250 }}}
He invested $1,250