Question 884939
Let {{{ x }}} = amount invested @ 6%
{{{ 12000 - x }}} = amount invested @ 7.5%
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{{{ .06x + .075*( 12000 - x ) = 810 }}}
{{{ .06x + 900 - .075x = 810 }}}
{{{ -.015x = -90 }}}
{{{ x = 6000 }}}
{{{ 12000 - 6000 = 6000 }}}
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They need to invest half of the $12,000
at each rate
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check:
{{{ .06x + .075*( 12000 - x ) = 810 }}}
{{{ .06*6000 + .075*6000 = 810 }}}
{{{ 360 + 450 = 810 }}}
{{{ 810 = 810 }}}
OK