Question 1040328
Let {{{ x }}} = amount invested in 7% bonds
{{{ 20000 - x }}} = amount invested in 8% bonds
---------------------------------------
{{{ .07x }}} = profit from 7% bonds
{{{ .08*( 20000 - x ) }}} = profit from 8% bonds
---------------------------------------
given:
{{{ .08*( 20000 - x ) = .07x + 700 }}}
{{{ 1600 - .08x = .07x + 700 }}}
{{{ .15x = 900 }}}
{{{ x = 6000 }}}
She invested $6,000 in 7% bonds
-----------------------------
check:
{{{ .08*( 20000 - x ) = .07x + 700 }}}
{{{ .08*( 20000 - 6000 ) = .07*6000 + 700 }}}
{{{ .08*14000 = 420 + 700 }}}
{{{ 1120 = 1120 }}}
OK