Question 965166
Let {{{ x }}} = amount invested @ 15%
{{{ 42000 - x }}} = amount invested @ 12%
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{{{ I = P*r*t }}}
I think they want {{{ t = 1 }}} ( 1 year )
Make this 2 equations:
{{{ I[1] = P[1]*r[1]*1 }}}
{{{ I[2] = P[2]*r[2]*1 }}}
{{{ r[1] = 15/100 }}}
{{{ r[2] = 12/100 }}}
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Add the equations
{{{ I[1] + I[2] = x*( 15/100 ) + ( 42000 - x )*( 12/100 ) }}}
{{{ 5790 = (3/20)*x + ( 3/25 )*( 42000 - x ) }}}
Now find {{{ x }}} and {{{ 42000 - x }}}