Question 1006153
Let {{{ r }}} = the rate at which she must invest
the rest of her money
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{{{  .12*10000 + r*7000 >= 1900 }}}
{{{ 1200 + 7000r = 1900 }}}
{{{ 7000r = 700 }}}
{{{ r = .1 }}}
{{{ .1*100 = 10 }}}
The rest of her money must be invested at 10% simple interest